A student is investigating genetics by performing crosses between fruit flies. In their first cross, they select a male with the genotype NEe and cross it with a NNee female.
• N- Normal Wings
• n - Vestigial Wings
• E - Red Eyes
• e - Sepia Eyes
What percentage (or fraction) of the offspring would you expect to have vestigial wings and sepia eyes? Be sure to show your work for full credit.
Answers
The percentage (or fraction) of the offspring that we would expect to have vestigial wings and sepia eyes is 0% and 25%.
What are vestigial wings?Vestigial wings are an example of vestigial organs which are present in certain insects such as fruit flies, but does not help them to fly.
To answer the given question, we can use the principles of Mendelian genetics and the Punnett square.
The genotypes of the parents:
Male (NnEe): Nn (normal wings) and Ee (red eyes)
Female (NNee): NN (normal wings) and ee (sepia eyes)
The probability of any offspring having the nn genotype (i.e., vestigial wings) is,
1/2 × 0 = 0.
The probability of any offspring having the ee genotype (i.e., sepia eyes) is,
1/2 × 1/2 = 1/4.
In summary, we would expect 0% (or none) of the offspring to have vestigial wings and sepia eyes, but we would expect 25% (or 1/4) of the offspring to have normal wings and sepia eyes.
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Related Questions
If a cell’s life cycle was approximately 72 hours long, how long, in minutes, would the cell spend in each of
the following phases:
a. interphase
b.prophase
c. metaphase
d. anaphase
e. telophase
Answers
Accordingly, if we take a 72-hour period into consideration, the ces would spend 3000 minutes in interphase, 540 minutes in prophase, 384.6 minutes in metaphase, 233.4 minutes in anaphase, and 155.4 minutes in telophase.
Duration We discover that throughout a 24-hour period, the cells we watched spent 1000.2 minutes in interphase, 180 minutes in prophase, 128.1 minutes in metaphase, 77.8 minutes in anaphase, and 51.8 minutes in telophase.Different types of cells have a very wide range in the length of various cell cycle phases. For a typical rapidly proliferating human cell with a total cycle duration of 24 hours, the G1 phase could last approximately 11 hours, the S phase approximately 8 hours, the G2 phase approximately 4 hours, and the M phase approximately 1 hour.For more information on cell cycle kindly visit to
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Which statement best describes how a bee moves pollen from one plant to another?
Answers
Answer:
When a bee lands on a flower, the hairs all over the bees' body attract pollen grains through electrostatic forces.
Stiff hairs on their legs enable them to groom the pollen into specialized brushes or pockets on their legs or body, and then carry it back to their nest.
What is a solution's molarity, if its absorbance is 0.8?
Answers
A molar solution is defined as an aqueous solution that contains 1 mole (gram-molecular weight) of a compound dissolved in 1 liter of a solution
What is a Molar Solution?Molarity is the number of moles of solute per liter of solution. For example, if you diffuse table salt in water, salt is the solute, molarity, and water is the solution. One mole of sodium chloride weighs 58.44 grams. If you melt 58.44 grams of NaCl in one liter of water, you have a one-molar solution, shortened as 1M
Molarity of a given solution is defined as the total number of moles of solute per liter of solution. while the molarity of a solution is identical to the moles of solute divided by the volume of solution in liters.
So we can conclude that Molarity is another quality expression of solution concentration.
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The molarity of a solution with an absorbance of 0.8 would be indeterminable without more information.
Obtaining the molarity of a solution from its absorbanceThe absorbance (A) of a solution is a measure of its ability to absorb light and is related to its concentration.
The relationship between absorbance and concentration is described by the Beer-Lambert law, which states that A is proportional to the concentration of the absorbing species in the solution (c), the length of the path the light travels through the solution (l), and a constant, the molar absorptivity (ε), which is specific to the absorbing species:
A = ε * c * l
To determine the concentration of a solution if its absorbance is known, we need to know the value of the molar absorptivity (ε) for the absorbing species and the length of the path the light travels through the solution (l).
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Using same information about Hemophilia , cross a woman whose blood clots normally with a man has hemophilia . Show genotypic and phenotypic percentages of the generation .
Answers
Normal-blooded women and men with hemophilia produce offspring with a percentage of 50% carrier girls (XᴴXʰ) and 50% normal boys (XᴴY).
Determining the percentage of offspring genotypesTo find the genotype of the offspring, first determine the genotype of the parents. From the data in the question, genotypes can be made as follows:
Normal blood woman = XᴴXᴴHemophiliac man = XʰYAfter the genotype is found, then cross the genotype:
Mother × Father
XᴴXᴴ × XʰY
Xᴴ × Xʰ, Y
--> Xᴴ × Xʰ = XᴴXʰ (carrier woman)
--> Xᴴ × Y = XᴴY (normal man)
From the results of the cross above, two offspring were produced, namely a carrier female and a normal male. So it can be concluded that the percentage of offspring is 50% carrier women and 50% normal men.
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A solution of potassium chlorate, KClO3, has 10 grams of the salt dissolved in 100 grams of water at 40 ºC. Approximately how many more grams of the salt can be added to the solution before reaching the saturation point?
Answers
An additional 26 grams of potassium chlorate could be added before reaching the saturation point.
How did we get this assertion?The solubility of potassium chlorate in water at 40 ºC can be found using reference tables. According to those tables, the solubility of potassium chlorate in water at 40 ºC is approximately 36 grams per 100 grams of water.
Since the solution already contains 10 grams of potassium chlorate, this means that an additional 26 grams of potassium chlorate could be added before reaching the saturation point.
It's important to note that the solubility of a salt in water can be affected by various factors, including temperature, pressure, and the presence of other ions in solution, so these values should be taken as approximate.
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Building Vocabulary: Protein Production Can you complete this paragraph about the cellular processes involved in protein production? Part A Drag the terms on the left to the appropriate blanks on the right to complete the sentences. Reset Help transcription The cellular processes that results in the production of protein begin in the where the mRNA DNA resides. There, the process of creates a molecule of RNA from a molecule of RNA polymerase DNA. The enzyme that performs this process is called . The RNA molecule, which exits the nucleus, is a specific kind of RNA called Once it exits the nucleus via the ribosome tRNA nuclear pores, this molecule travels to a cellular organelle called the . There, the sequence of nucleotides on this molecule is used to create a molecule of protein through the process called This process is helped along by molecules of , each of which nucleus translation recognizes one nucleotide triplet and carries the corresponding amino acid.
Answers
The DNA is located in the NUCLEUS, where the biological processes that lead to the creation of protein start.
There, a DNA molecule and an RNA molecule are produced by the TRANSCRIPTION process. This procedure is carried out by an enzyme known as RNA POLYMERASE. The RNA molecule that leaves the nucleus is a particular type of RNA known as mRNA.
This molecule moves to the RIBOSOME, a cellular organelle, after leaving the nucleus through the nuclear pores. There, a procedure known as TRANSLATION is employed to build a protein molecule from the nucleotide sequence on this molecule.
The molecules of tRNA, which each identify one nucleotide triplet and carry the associated amino acid, aid in this process.
Anatomy of a nucleusThe nucleus of the cell contains the majority of its genome.
Chromosomes, which are long DNA stands that are protected and organized by various proteins like histones, are frequently formed from nuclear DNA.
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Why were the earliest cells likely heterotrophs and not autotrophs? (4 points)
Most organisms were multicellular.
They lived in water.
There were low levels of carbon dioxide in the atmosphere.
The atmosphere was high in nitrogen.
Answers
According to the research, the correct answer is Option C. The earliest cells likely heterotrophs and not autotrophs because there were low levels of carbon dioxide in the atmosphere.
What are heterotrophs?They are those that feed on other organisms since they cannot take an inorganic substance and create organic matter for themselves.
In this sense, this characteristic of their nutrition makes them always depend on another living being for their subsistence since in the extreme conditions of the atmosphere in formation, only these simple organisms could obtain energy, nitrogen and carbon from feeding on other living beings.
Therefore, we can conclude that according to the research, Heterotrophs do not have an independent food production system.
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. In a salt marsh in Agusan, the quantity of solar radiation reaching the ground during the summer is 7,000,000cal/m2/day. The gross productivity of the producers in the salt marsh (mostly microscopic algae) is 0.0040 g/cm2/day. The average rate of respiration (the respiration requirement) is 35% of the gross primary productivity. Ecologists have found that 1 gram of salt marsh producers (the algae) is equivalent to 2,920 calories.
Answers
The algae in the salt marsh are very efficient in their use of the solar radiation they receive.
What is solar radiation?Solar radiation is the energy emitted by the sun in the form of electromagnetic waves. These waves consist of visible light, infrared radiation, and ultraviolet radiation. Solar radiation is important for life on Earth as it provides the energy for photosynthesis and drives the water cycle.
The amount of solar radiation reaching the ground in a salt marsh in Agusan during the summer is 7,000,000cal/m2/day. This energy is used by the producers (microscopic algae) to photosynthesize and produce organic matter. The gross primary productivity (GPP) of the producers in the salt marsh is 0.0040 g/cm2/day. This means that the algae are able to produce 0.0040 grams of organic matter per square centimetre of salt marsh every day.
The respiration requirement for the algae is 35% of the GPP. This means that in order for the algae to survive, they must use 35% of the GPP for respiration. This leaves 65% of the GPP to be used for growth and other metabolic needs.
Finally, ecologists have found that 1 gram of salt marsh producers (the algae) is equivalent to 2,920 calories. This means that 1 gram of algae in the salt marsh contains enough energy to provide 2,920 calories. This indicates that the algae in the salt marsh are very efficient in their use of the solar radiation they receive.
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Construct an argument supported by evidence as to how the increase in human population and per capita consumption of natural resources has affected Earth’s systems.
Answers
The increase in human population and per capita consumption of natural resources has had significant impacts on Earth's systems. Here is an argument supported by evidence highlighting these effects:
Climate Change: The rise in human population and increased consumption of fossil fuels for energy production, transportation, and industrial activities have resulted in higher greenhouse gas emissions. This has led to the accumulation of carbon dioxide and other greenhouse gases in the atmosphere, contributing to global warming and climate change.Deforestation and Habitat Loss: The growing demand for agricultural land, timber, and urbanization has driven extensive deforestation worldwide. Forests are crucial for carbon sequestration, biodiversity conservation, and regulating local and regional climate patterns. Water Scarcity and Pollution: As the global population increases, so does the demand for freshwater resources. Agriculture, industry, and domestic use place immense pressure on water sources. Over-extraction, pollution from industrial and agricultural activities, and inadequate water management practices have resulted in water scarcity in many regions. Biodiversity Loss and Ecosystem Disruption: The expansion of human settlements, infrastructure development, and resource extraction have led to habitat destruction, fragmentation, and loss of biodiversity. Species extinction rates are now estimated to be 100 to 1,000 times higher than the natural background rate. functions, threatening the stability and resilience of Earth's systems.Pollution and Waste Generation: The increase in population and consumption has resulted in the generation of vast amounts of waste, including plastics, electronic waste, and hazardous materials. Improper waste management practices contribute to pollution of air, water bodies, and soil, negatively impacting ecosystems and human health.These examples illustrate the profound effects of the increase in human population and per capita consumption on Earth's systems. The evidence supports the urgent need for sustainable practices, resource conservation, and a transition to cleaner energy sources to mitigate further damage and ensure the long-term well-being of our planet.
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Animals that eat a variety of meats, fruits, and vegetables are
a
carnivores.
b
omnivores.
c
decomposers.
d
herbivores.
Answers
Answer:
The answer is B.
Explanation:
Go back to the simulation and increase the number of molecules of heavy species to 700. What change do you observe?.
Answers
If you increase the number of molecules of heavy species to 700 the container expands/gets bigger when molecules are introduced. The molecules also exert pressure and move more slowly.
Why does the pressure change as the number of molecules increases?
The gas molecules' kinetic energy rises, increasing the force with which they collide with the container's walls. The outcome is a twofold increase in gas pressure.
Pressure rises when the number of gas molecules rises while the volume of the container stays the same. Gas pressure rises as container volume decreases. The pressure rises as the temperature of a gas inside a rigid container rises.
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What is the role of a centromere?
A. To protect the middles of chromosomes
B. To regulate which genes are used to make proteins
C. To connect sister chromatids before cell division
D. To wrap around histones in order to package DNA in
chromosomes
Answers
The correct answer is C. The role of a centromere is to connect sister chromatids before cell division.
What is cell division?It is the process by which a single cell divides into two or more daughter cells. It is a fundamental process that allows living organisms to grow, develop, and repair tissues. Two types of cell division are : mitosis and meiosis. During cell division, chromosomes need to be replicated and separated into two daughter cells. The replicated chromosomes consist of two identical copies, called sister chromatids, that are held together at the centromere. The centromere is a specialized region of the chromosome where the kinetochore, a protein structure, forms and attaches to the spindle fibers that pull the sister chromatids apart during cell division.
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The most common reason that introduced species cause trouble is because they are larger than native species. True or False
Answers
The fact that introduced species can result in biological exponential multiplication does not mean that they are a threat to biodiversity.
Biodiversity is defined as the variety of all living things, including various plants, animals, and microorganisms. It is often investigated at three levels: genetic diversity, species diversity, and ecological diversity. We cannot have healthy ecosystems, which we rely on to provide the air we breathe and the food we consume, without a variety of animals, plants, and bacteria. One reason why introduced species are a hazard to biodiversity is that they have the potential to become invasive species that supplant native species and prey on native species, causing unnatural reductions in native species populations. Even if imported species have the potential to multiply biologically exponentially, this does not necessarily entail that they endanger biodiversity.
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Create a hypothesis using the following info:
You have had some practice using the compound light microscope to view a variety of objects. Now you are ready to prepare your own slide of the plant cell under isotonic and hypotonic solution, and view it using the compound light microscope. From learning about diffusion and osmosis, you know that plant and animal cells are filled with cytoplasm, which is a jelly-like fluid that consists of water and solutes (salts, sugars, carbon dioxide, fat droplets, etc). Cells are surrounded by extracellular fluid, which also consists of water and solutes. The balance between the water and solutes in the cytoplasm and extracellular fluid is achieved through the process of diffusion and osmosis. In this lab, you will find out what happens to onion cells when they are placed in a hypotonic or hypertonic solution.
Answers
Hypothesis: When onion cells are placed in a hypotonic solution, they will absorb more water due to osmosis, causing the cells to swell and increase in size. Conversely, when onion cells are placed in a hypertonic solution, they will lose water through osmosis, causing the cells to shrink and decrease in size. This will be observed through the use of the compound light microscope.
At the molecular level, ______ is the process by which a gene's information is used to produce a polypeptide or functional RNA molecule.
Multiple choice question.
A. gene expression
B. genomic editing
C. gene manifestation
D. genomic imprinting
Answers
Answer:
A. gene expression
Explanation:
Gene expression is the process by which the information stored in a gene is used to direct the synthesis of a protein or RNA molecule. It is the process by which a gene's DNA code is translated into a functional product. Gene expression is regulated by a variety of factors, including signals from other cells, hormones, and environmental cues, which determine which genes are expressed, and when and how much of a given protein is produced. The process of gene expression is crucial to the development, growth, and maintenance of living organisms, as it determines the characteristics and functions of cells, tissues, and organs.
ALLEN
Identify the advantages of using a database to collect and maintain healthcare information about patients and research. Select all that apply. provides shared information provides jobs for data entry workers reduces errors and increases efficiency data is centralized and accurate information can be organized for each team member
Answers
The advantages of using a database to collect and maintain healthcare information about patients and research include:
provides shared informationreduces errors and increases efficiencydata is centralized and accurate information can be organized for each team memberWhat are the advantages of using a database to collect and maintain healthcare information?Having a centralized database reduces the risk of errors and duplications, improves efficiency in retrieving and updating information, and allows for accurate and organized information to be accessible to all team members.
This can ultimately lead to better patient care and informed research decisions.
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Answer:
a
c
d
e
Explanation:
The Irish Lumper variety of potato was introduced into Ireland in the early 1800s. The Lumper soon became the only variety of potato grown in much of Ireland. The potato blight destroyed most of the Lumper crop between 1845 and 1852 resulting in the death of about 1 million Irish from starvation.
A researcher suggests that the Irish monoculture (growing a single crop) of the Lumper potato did not significantly change the overall resistance of the potato crop in Ireland to diseases. Which of the following observations best refutes this null hypothesis?
A - Before the arrival of the potato blight, there were already two other potato plant diseases in Ireland.
B - The number of fatalities from the Irish potato famine was greater than the rest of the European countries combined.
C - During the early nineteenth century, the vast majority of people in Ireland depended on the Lumper potato for food.
D - Growing more varieties of potatoes increases competition for available resources, which may yield fewer potatoes.
Answers
The number of fatalities from the Irish potato famine was greater than the rest of the European countries combined. Thus the correct answer is option (B).
Irish potatoes' genetic homogeneity made the potato famine that wiped out Ireland's population and economy worse. Evolutionary theory warns against relying on crops with little genetic variety. We might be able to stop significant crop loss caused by shifting environmental circumstances if we pay attention to expert advice and historical lessons. The Irish were able to feed their expanding population in the 1800s by cultivating potatoes. They grew only the "lumper" variety of potato. Furthermore, because potatoes can be replicated vegetatively, all of these lumpers were identical clones. For a while, the lumper gave Ireland food, but it also created the circumstances that resulted in significant economic and social catastrophe. According to evolutionary theory, populations with lesser genetic diversity are more vulnerable to changing environmental conditions than populations with higher genetic diversity. When the ecology of the country changed and a potato disease appeared there in the 1840s, the potatoes (and the people who depended on them) were destroyed. It is likely that the Irish potato clones had little genetic variation.
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When does the egg begin the 2nd round of meiosis?
A) when the egg was first made
B) before it is released from the ovary
C) after a sperm enters the egg cell
Answers
Answer: After ovulation the oocyte is arrested in metaphase of meiosis II until fertilization. At fertilization, the secondary oocyte completes meiosis II to form a mature oocyte (23,1N) and a second polar body.
Explanation:
suggest any two contraceptive methods to control the size of human population and explain them
Answers
The shaded individuals in the pedigree diagram below are color-blind. The
only unknown is whether the mother in the first generation has normal color
vision.
What is true about the mother?
A. She must have normal color vision.
B. She must be color-blind.
C. She could be homozygous for normal color vision.
D. She could be heterozygous for color blindness.
Answers
The correct answer is D. She could be heterozygous for color blindness.
What is Color Blindness?
Color blindness is a condition in which a person's ability to perceive colors is impaired. Most cases of color blindness are genetic and are caused by a defect or absence of the color-sensitive pigment in the cones of the retina. This defect or absence can affect one or more of the three types of cones that are responsible for detecting red, green, and blue light.
In the pedigree diagram, the shaded individuals are color-blind, which is a recessive X-linked trait. This means that the individuals in the pedigree who are shaded must have inherited a color-blindness allele from both of their parents, and that the mother of the first generation could be either homozygous for normal color vision (XX) or heterozygous for color blindness (XbX).
If the mother in the first generation had normal color vision, she would have to be homozygous for normal color vision (XX), and all of her sons would also have normal color vision because they would inherit a normal X chromosome from her. However, this would mean that none of her daughters would be color-blind, and there are shaded females in the pedigree. Therefore, it is not possible for the mother to have normal color vision.
If the mother in the first generation is heterozygous for color blindness (XbX), she would have a 50% chance of passing on the color-blindness allele to each of her children. This means that all of her sons would have a 50% chance of being color-blind, as shown in the pedigree, and that her daughters would have a 50% chance of inheriting one copy of the color-blindness allele and being carriers, but they would not be color-blind themselves. This is consistent with the shaded females in the pedigree who are carriers of the color-blindness allele.
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A cross was carried out between pure breed tall pea plant with pure dwarf pea plant and F¹ progeny was obtained
Answers
Answer:
This is an example of a genetic cross in biology, specifically a monohybrid cross. The F1 progeny are the offspring of the cross between the purebred tall and purebred dwarf pea plants, and they exhibit a phenotype (observable physical characteristics) that is a combination of the traits of both parents. This type of cross allows for the examination of dominant and recessive traits, as well as the study of inheritance patterns.
Explanation:
Answer: A cross was carried out between pure breed tall pea plants with pure dwarf pea plants and F¹ progeny is obtained.
Explanation:
When tall plants were crossed with the dwarf pea plants in Mendel’s experiment, then in the first generation i.e. F1 progeny, only tall plants were obtained and no dwarf plant was obtained.
In F2 progeny, there were both tall and dwarf pea plants. The ratio of dwarf and pea plants was found to be 3:2.
In F2 progeny, there were both tall and dwarf pea plants. The ratio of dwarf and pea plants was found to be 3:2 which confirmed that in F2 progeny, both the characteristics were inherited and the tall character of the pea plant was found to be dominative and dwarf to be recessive. This was the law of segregation which says that when plants of different traits were crossed, then in the first progeny only the dominant character was observed whereas, in the F2 progeny, both dominant and recessive traits were obtained.
When a chemical reaction is at equilibrium, which of the following statements is true?
A. The concentrations of reactants and products are equal.
B. The rate of the forward reaction is equal to the rate of the backward reaction.
C. The ratio of the concentrations of reactants and products equals 1.0.
D. The reaction is proceeding in the forward direction at a rate to K'eg.
E. The reaction is proceeding in the reverse direction at a rate to K'eg.
Answers
ANSWER
The answer isA
Explanation:
it is because in a chemical equilibrium forward reaction equals backward reaction.it is a reverse reaction.
Dew point is the temperature to which air would have to be warmed (with no change in air pressure or moisture content) for saturation to occur.
a. True
b. False
Answers
Answer:
A True
Explanation:
Answer:
a. True
Explanation:
The dew point is the temperature at which air is saturated with water vapor and condensation occurs. When the temperature of the air reaches the dew point, moisture condenses into droplets, forming dew, fog, or cloud. The dew point is an important measure of atmospheric moisture and can have a significant impact on weather and climate. A high dew point indicates a high amount of moisture in the air, while a low dew point indicates low atmospheric moisture. The dew point is calculated based on the temperature and relative humidity of the air, and can be used to forecast the likelihood of precipitation or other weather-related events.
Which of the following is NOT part of an investigation?
A. pseudoscience
B. data
C. equipment
D. method
Answers
Pseudoscience is not part of an investigation. The correct option is A.
What is investigation?An investigation is a methodical, scientific procedure that involves observation, data collection, and analysis in order to provide an answer to a question or find a solution to a problem.
The following components of an investigation are typically present: data, apparatus, and procedure.
Claims, beliefs, or behaviors that are presented as scientific but do not have a foundation in empirical data or adhere to the scientific method are referred to as pseudoscience. Science that is conducted legitimately does not include pseudoscience.
Thus, the correct option is A.
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The organisms classified here belong in the kingdom __________ in the domain
Answers
Answer:
Animalia; Eukarya
Explanation:
Answer:
. Eukarya; Animalia Eukaryotic cells are found in organisms of the domain Eukarya. These individuals are also Animalia kingdom representatives.
Explanation:
A domain is a more expansive category than a kingdom. There are three domains in this system: domain Bacteria (which corresponds to domain Eubacteria), domain Archaea (which corresponds to kingdom Archaebacteria), and domain Eukarya (which corresponds to kingdoms Fungi, Plantae, Animalia, and kingdom "Protista").
One of the four nucleotide bases in DNA is replaced by a different base in RNA. Which base is it, and what is it replaced by?a. transcription and then translation
b. thymine, replaced by uracil.
c. both a and c are correct
d. hydrogen bond.
Answers
One of the four nucleotide bases in DNA will be replaced by a different base in RNA. The base is thymine and it is replaced by uracil in RNA. Option B is correct.
DNA and RNA are nucleic acids that are composed of nucleotide subunits, each consisting of a sugar, a phosphate group, and a nitrogenous base. The four nitrogenous bases found in DNA are adenine (A), cytosine (C), guanine (G), and thymine (T), while RNA uses uracil (U) instead of thymine.
During transcription, the process by which RNA is synthesized from a DNA template, RNA polymerase reads the DNA sequence and incorporates complementary RNA nucleotides, creating a single-stranded RNA molecule that is complementary to the DNA template.
In RNA, uracil (U) pairs with adenine (A) via hydrogen bonds, while in DNA, thymine (T) pairs with adenine (A) via hydrogen bonds. Therefore, during transcription, thymine is replaced by uracil in RNA, which allows for base-pairing with adenine and ultimately the production of the RNA molecule.
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Red blood cells carry antigens on their surfaces coded for by alleles of the gene designated by the letter i. Ia is dominant to i and produces antigen a on the surface of red blood cells. The ib allele is also dominant to the i allele and produces antigen b on the surface of red blood cells. The i allele does not produce surface antigens.
Answers
Red blood cells carry antigens on their surfaces that are determined by alleles of the gene designated by the letter "i". The Ia allele is dominant over the i allele and produces antigen "a" on the surface of red blood cells.
The ib allele is also dominant to the i allele and produces antigen "b" on the surface of red blood cells. The i allele does not produce any surface antigens. This information can be useful in blood transfusions and understanding the immune system, as an individual with the Ia allele will have red blood cells with antigen "a" on their surface and an individual with the ib allele will have red blood cells with antigen "b" on their surface. These antigens can trigger an immune response if mismatched during a blood transfusion, so it is important to match blood type based on these antigens.
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1) Which is not true about polyploidy?
A) It is caused by crossing over
B) It can produce hardy and vigorous plants
C) It never occurs in animals
D) It is lethal in humans
Answers
Answer:
It should be A) It is caused by crossing over
Choose one of the following two sides. Make an argument in favor of it over the other option. Clearly indicate which option you chose.
A. The United States should encourage the United Nations to help reduce population growth rates in developing nations because doing so will help get the global population size closer to the planet's carrying capacity.
B. The United States should not encourage the United Nations to help reduce population growth rates in developing nations because they should have the same opportunity to grow as the US did in the past.
Answers
Answer: Option A is the correct answer
Explanation: A. The United States should encourage the United Nations to help reduce population growth rates in developing nations because doing so will help get the global population size closer to the planet's carrying capacity.
17. Researchers can add several adenine nucleotides to the end of a strand of mRNA. What could be a practical application of this procedure?
18. A researcher develops a new form of polymerase chain reaction that can amplify long sequences of DNA. Is this technique likely to replace entirely the use of bacteria as cloning vectors? Why or why not?
19. You are studying DNA replication in bacterial cells. In one culture, you note that replication is not producing visible daughter cells. Your analysis shows that about 50% of the daughter cells appear normal, while 50% are volatile and do not form a double helix.
a) Draw and label a diagram that could account for your observation
b) If you centrifuged the DNA from this culture, what would you expect to see?
Answers
18)No, the new form of polymerase chain reaction is unlikely to replace the use of bacteria as cloning vectors entirely. This is because bacteria provide several advantages, such as efficient and reliable replication of DNA, and a large number of sites for insertion of foreign DNA. Bacteria are also easy to manipulate and culture, making them a convenient and well-established tool for molecular biology.
19a) To account for your observation, a diagram could show that the DNA replication process is being affected by a mutation or damage to the DNA replication machinery, leading to errors in the replication process. This could result in a mixture of normal and abnormal daughter cells.
b) If you centrifuged the DNA from this culture, you would expect to see a mixture of normal and abnormal DNA molecules. The abnormal DNA molecules would likely be shorter and fragmented, while the normal DNA molecules would form a characteristic double helix.
