DDT was subsequently banned despite being very effective when used as pesticides because of its harmful side effect of: (B) bioaccumulation.
DDT has the full form Dichlorodiphenyltrichloroethane. It was a very commonly used pesticide or insecticide. It is a crystalline chemical compound. Apart from bioaccumulation, DDT was also responsible for the decrease in the reproductive rate of birds due to thinning of eggshells.
Bioaccumulation is the phenomenon where the intake of a chemical compound in an organism is more than its excretion or breakdown. In this phenomenon, the chemical agent quantity keeps building up gradually with time in an individual. Pesticide and pollution are the two most common reasons for bioaccumulation.
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some bacteria may be able to respond to environmental stress by increasing the rate at which mutations occur during cell division. how might this be accomplished?
By increasing the Genetic Variation within species some bacteria may be able to respond to environmental stress by increasing the rate at which mutations occur during cell division.
Increasing the rate of mutations during cell division would allow the bacteria to respond to environmental stress by increasing the genetic variation within types which could be easily altered to the environment. Genetic variations can arise from gene variants (also called mutations) or from a normal process in which genetic material is regrouped as a cell is getting ready to divide (known as genetic recombination). Over time, as generations of individuals with the feature continue to replicate, the superior feature becomes to grow common in a population, making the population variate than an inherited one
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Identify the allele that is expressed in a heterozygous individual.
The Three Domain classification system developed by Dr. Woese is based partly on
O sensitivity to antivirals.
O RNA sequences.
O enzyme similarities.
O DNA sequences.
Dr. Woese's three Domain classification approach is partially based on RNA sequences. The three-domain classification system was put forward as an alternative to the conventional prokaryote-eukaryote and five-kingdom concepts.
Organisms can be divided into one of three domains according to differences in the ribosomal RNA (rRNA) nucleotide sequences, antibiotic susceptibility, and membrane lipid structures. Woese divided them into groups based on differences in the 16S ribosomal RNA (rRNA) structure. Carl Woese from the University of Illinois in the United States proposed a phylogenetic taxonomy of bacterial species in 1987 using variations in the nucleotide sequence of 16S rRNA molecules.
Thus, we can conclude that RNA sequences serve as a foundation for some of Dr. Woese's Three Domain classification methods. Eukarya, Bacteria, and Archaea are the three domains.
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Using the graphs below, determine which water drop rate leads to the highest seed growth.(Note, the vertical axis represents the number of seeds, the blue lines represent the seeds and the green represents the sprouts)
a.
90 drops/hr
b.
72 drops/hr
c.
50 drops/hr
d.
12 drops/hr
Answer: 50 drops/hr
Explanation:
mrsa in humans is an example of selection. a. directional b. diversifying c. guided d. stabilizing e. uniform
MRSA is an example of directional selection in humans.
Methicillin-Resistant Staphylococcus aureus, also known as MRSA, is a kind of bacteria that can be potentially dangerous since it is resistant to some antibiotics and can cause skin infections and other types. Any S strain could be it. aureus that has acquired multiple drug resistance to beta-lactam antibiotics through horizontal gene transfer or directional selection.
Direct contact with an infected individual, touching surfaces or objects contaminated with the bacterium or exchanging personal things like infected towels or razors are all ways that MRSA is disseminated. Because so many people have weakened immune systems, it is therefore spreading quickly and directly throughout the healthcare industry.
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a researcher is studying a population of mosquitoes in a lake. the researcher is interested in two alleles of the same gene, d and d, in these mosquitoes. at the start of the study, the researcher calculates the following genotype frequencies in the mosquito population: dd 0.6, dd 0.17, and dd 0.23. when this population is re-sampled 10 years later, the researcher collects the following genotype frequencies: dd 0.4, dd 0.3, and dd 0.3. what can the researcher conclude about this mosquito population?
The researcher can conclude about this mosquito population is the population is evolving and it is not in Hardy-Weinberg Equilibrium (HWE).
What is the Hardy-Weinberg Equilibrium?Hаrdy-Weinberg Equilibrium (HWE) is used to estimаte the number of homozygous аnd heterozygous vаriаnt cаrriers bаsed on its аllele frequency in populаtions thаt аre not evolving. Аccording to HWE, for а locus with two аlleles А аnd а with corresponding frequencies p аnd q, three genotypes аre possible АА, Аа, аnd аа with expected frequencies p², 2pq, q², respectively.
From the research, we know that a researcher is interested in two alleles of the same gene, D and d. This means the researcher used Hardy-Weinberg Equilibrium. And from the genotype frequencies in the mosquito population, we can conclude that the mosquito population is evolving.
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which molecules synthesized by plants is a major source of energy for cellular processes in both plants
Glucose is a chemical that both plants and animals can produce and is a primary source of energy for cellular operations.
What is glucose?
Blood sugar, usually referred to as glucose, is the main sugar found in your blood.It comes from the food you eat and is the main energy source in your body.All of the cells in your body utilize glucose, which is transported by blood, to provide energy. Your blood sugar levels are excessively high if you have diabetes.Although there are many different kinds of carbohydrates, the body primarily uses glucose. Fructose and other sugars are converted into glucose and used as an energy source.All plants contain glucose, a sugar that has been solubilized. In addition to being a universal source of carbon, glucose also functions in plants as a signaling molecule, controlling a variety of metabolic activities.From germination to senescence, a variety of plant processes are controlled by glucose.Therefore, Glucose is the molecule that is the major source of energy
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which term refers to the connective tissue membranes surrounding the brain and spinal cord? multiple choice question.
Meninges refers to the connective tissue membranes surrounding the brain and spinal cord.
Your spinal cord is a cylindrical shape that runs via the center of your spine, from your brainstem on your low back. It's a delicate shape that carries nerve bundles and cells that convey messages out of your brain to the rest of your body. Your spinal cord is one of the main parts of your anxious machine.
The spinal wire is a protracted, thin, tubular structure made of fearful tissue, which extends from the medulla oblongata in the brainstem to the lumbar region of the vertebral column (backbone). The backbone encloses the imperative canal of the spinal cord, which includes cerebrospinal fluid.
The spinal cord is about 18 inches (forty five centimeters) in period and is exceptionally cylindrical in form.
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Which statement describes the role of DNA in a cell? A. DNA molecules are the building blocks of tissues and carry out the work of each cell. B. DNA molecules deliver the pieces of proteins to the site of protein assembly in the cell. C. DNA molecules are broken apart inside the cell, and the pieces are assembled into proteins. D. DNA molecules contain the information that the cell uses to assemble the pieces of proteins in the correct order.
DNA molecules contain the information that the cell uses to assemble the pieces of proteins in the correct order describes the role of DNA in a cell. Therefore, option (D) is correct.
What are the functions of DNA?DNA contains the instructions needed for an organism to develop, survive and reproduce. To carry out these functions, DNA sequences must be converted into messages that can be used to produce proteins, which are the complex molecules that do most of the work in our bodies.
DNA is responsible for carrying and transmitting hereditary materials or genetic instructions from parents to offspring. In addition to ensuring that all living things pass on their genetic information, DNA is essential for the synthesis of proteins.
DNA now has three distinct functions—genetics, immunological, and structural—that are widely disparate and variously dependent on the sugar phosphate backbone and the bases.
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after teaching a group of students about anticonvulsant therapy, the instructor determines that the teaching was successful when the group identifies which drug as eliciting its effects by increasing levels of gamma-aminobutyric acid (gaba), which stabilizes cell membranes?
Valproic acid eliciting its effects by increasing levels of gamma-aminobutyric acid (gaba) and steroidal drugs stabilizes cell membranes.
Valproic acid elevated GABA synthesis and launch in mind areas consisting of substantia nigra,146 that is concept to be worried withinside the manipulate of seizure technology and propagation. It additionally decreased the discharge of gamma-hydroxybutyric acid and attenuated neuronal excitation prompted via way of means of NMDA-kind glutamate receptors.
Vamorolone Stabilizes Dysferlin-Deficient Cell Membrane via way of means of Reducing Lipid Mobility. Lipophilic molecules, such as steroidal drugs, can have an effect on membrane pressure in addition to lateral diffusion of proteins and lipids withinside the plasma membranes
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BRAINLIESTTT ASAP!!!
-recognize the names and relative ages of extinct hominids ( EXPLAIN THEM )
The group made up of all of our close relatives as well as extinct entire human race and current humans.
Which came first, hominids or hominins?Modern humans as well as all our extinct relatives on our own branching of the phylogenetic ladder are now referred to as hominins instead of hominids, as they were in previous classifications.
Exist hominins today?The hominins, a term used to describe a broad group of extinct humans and apes with human features, are now exclusively recognized as Homo sapiens. Around 20 species are included in this category, and there are likely many more that are still undiscovered. You might also be interested in: Human proximity changes animals.
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when pyruvate is used to make one molecule of glucose, 1) how many molecules of atp/gtp are consumed? 2) how many are generated? 3) what is the total cost of gluconeogenesis?
When pyruvate is used to make one molecule of glucose
4 ATP, 2 GTP are used.2 ATP and 2 NADH are generated.4ATP, 2 GTP, and 2 NADH are used.In gluconeogenesis, glucose is created. It is essentially glycolysis carried out reverse; the standard free energy is favorable thanks to three new processes involving four new enzymes. ATP is used by the gluconeogenesis pathway, which gets its energy mostly from oxidizing fatty acids.
The molecule can be transferred from the mitochondria thanks to the conversion to malate. After entering the cytoplasm, mitochondria convert it back to oxaloacetate.
Malate + NAD+ Oxaloacetate + NADH in the cytoplasm
PEP GDP Oxaloacetate + GTP
It then passes through the same intermediates as glycolysis from this point on. The endoplasmic reticulum hosts the final reaction.
G6P glucose is present in the endoplasmic reticulum (catalyst: glucose-6-phosphatase). A glucose transporter shuttles the glucose out into the extracellular space.
For every molecule of glucose synthesized from two molecules of pyruvate, 4 ATP, 2 GTP, and 2 NADH are used.
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what is the probability of producing the genotype aabbcc in a cross of individuals who both possess this genotype: aabbcc?
1/64 is the probability of producing the genotype aabbcc in a cross of individuals who both possess this genotype.
The genotype AaBbCcDd has 4 genes that are heterozygous and can produce 24 different types of gametes.
What about genotype?Gene pool as a whole is characterized by the term "genotype," which broadly refers to an organism's genetic make-up.The phrase can also be used to describe to the alleles, or different forms of a gene, that an organism carries in a more specific meaning. In contrast, AS and SS shouldn't even consider getting married because there is a good probability that they will have a child who has sickle cell disease. Additionally, there is no way to avoid producing a child with sickle cell disease, so SS and SS must not be married.A genotype is a numerical representation of the type of variant found at a particular locus (i.e., region) in the genome.As an example, the letters BB, Bb, and bb could be used to indicate a specific gene variant.Despite the possibility of random spontaneous mutations, genotype typically does not vary from one environment to another. The same genotype, however, might result in a variety of phenotypes.Learn more about genotype here:
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bile acids (part of bile) work as emulsifiers to aid in fat digestion. after fat digestion in the small intestine is complete, what happens to most of these bile acids?
After the fat has been digested, fatty acids are passed through the lymph system and then pass throughout the body.
Bile may be a liquid that's made and discharged by the liver and put away within the gallbladder. Bile makes a difference in digestion. It breaks down fats into fatty acids, which can be taken into the body by the stomach-related tract. Bile contains Mostly cholesterol Bile acids Bilirubin, Water Body salts such as potassium and sodium, Copper, and other metals. After the fat has been processed, fatty acids are passed through the lymph system and after that through the body through your bloodstream to be utilized or put away for energy, development, and cell repair.
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4) over time, the movement of people on earth has steadily increased. this has altered the course of human evolution by increasing . a. mutation b. geographic isolation c. genetic drift d. gene flow
Over time, the movement of people on earth has steadily increased. this has altered the course of human evolution by increasing gene flow. Thus the correct answer is option (e).
Evolution is the term used to describe how a species gradually changes over time to fit in with nature.
The term "gene flow" refers to the movement or exchange of genetic material from one continent to another. The flow of genes caused by gene exchange has changed the native genes and created a new character.
Specifications of gene flow.
New genetic variations are disseminated throughout many populations.
It alters both populations' allelic frequencies and may be the driving force behind evolution.
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According to the results of this experiment, germination of tobacco seeds during the first week is ______.
According to the results of this experiment, germination of tobacco seeds during the first week is increased by exposure to light.
It is presumable that light affects the germination of tobacco seeds in at least two different ways. It does this by first turning on the PHY signal pathway, which releases photo-dormancy and encourages germination. Second, in tobacco seeds that are not photo-dormant, light speeds up endosperm rupture. Therefore, on performing an experiment to germinate tobacco seeds, germination would increase on exposure to light.
Because the tobacco seed is so tiny, it must be sown indoors. It needs a minimum temperature of 65 degrees in order to germinate. Six weeks before the last frost, plant the seed in seed compost rather than potting soil. When planting, just lay the seed directly on top of the compost.
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if meselson and stahl never saw their original band of labeled dna move or change, what would that have supported?
If Meselson and Stahl never saw their original band of labeled DNA move or change, the experiment would have supported the model of semi-conservative.
The experiment carried out by Meselson and Stahl proved that DNA replicates semi-conservatively, i.e., each strand of a DNA molecule acts as a template for the synthesis of a new, complementary strand. These studies, according to Meselson and Stahl, demonstrated the semi-conservative nature of DNA replication. The DNA strands split apart and replicated one another, resulting in daughter molecules that included both an "old" and a "new" DNA strand.
When a new double-stranded DNA molecule is created, one strand will come from the original template molecule, making DNA replication a semi-conservative process. There will be a brand new strand created. In order to separate various compounds in a solution, Meselson and Stahl utilized density-gradient centrifugation. Later, they used the same technique to separate DNA molecules in a solution.
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protein threads that form the basis of a clot: a.hemoglobin b.fibrinogen c.globulin d.thrombin e.fibrin
Protein threads that make the basis of a clot is termed Fibrin.
So, the correct option is E.
A blood clot is mostly made up of fibrin, an insoluble protein that is generated in reaction to bleeding. It is made of fibrinogen, a soluble protein generated by the liver and present in blood plasma, which is a stiff protein material that is structured in long fibrous chains. Following this, fibrin molecules combine to form lengthy fibrin threads that entangle platelets, accumulating a spongy mass that gradually hardens and contracts to form a blood clot.
The blood clot is made up of a tangled web of filaments that is created when fibrinogen is converted into insoluble fibrin and then cross-linked. Because plasma contains fibrinogen, it can clot on its own.
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The scientific study of how organisms relate to one another and their surroundings is known as what?.
The study of organisms and their relationships to their surroundings is called ecology. The interaction of living creatures with their environments is the subject of ecological research.
What are some instances of ecology?An ecosystem ecologist might, for instance, gain knowledge about how beaver dams effect water flow in a forest ecosystem and how it affects the survival or aquatic species or the dispersion of silt. A coral ecologist may research the effects of variations in water temperature on coral survival.
What purpose does ecology serve?Ecology is crucial to human welfare and wealth and improves our earth. It provides new insight into how interdependence between people and nature is crucial for maintaining biodiversity in the face of climate change, providing enough food, and preserving clean air and clean water.
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Gas cloud 1 is likely to form a star. Gas cloud 2 is not. Based on this information, match the given conditions with each cloud.
Its temperature stays well
below 14 million Kelvin.
Its volume shrinks and density
increases due to gravity.
It is spread out, with a greater volume and
lesser concentration of elements.
Its hydrogen atoms retain their electrons.
Its temperature surpasses
14 million Kelvin.
Its hydrogen atoms shed their electrons.
Gas cloud 1: It spreads with a larger area and a lower elemental concentration. Its temperature never rises above 14 million Kelvin. It has hydrogen atoms with electrons retained.
Gas cloud 2: As a result of gravity, its volume decreases and density rises. Its temperature is consistently above 14 million kelvin. The electrons in hydrogen atoms are lost.
As you are undoubtedly aware, stars develop amid gaseous clouds. Interstellar gases, primarily made of dust and hydrogen, are present in these clouds. Low temperatures cause gases to react, mix, and form molecules, which then produce clouds and continue to react until they eventually form stars.
Since Cloud 1 spreads with a higher volume and a smaller concentration of components, its temperature maintains far below 14 million Kelvin, and it contains hydrogen atoms that retain their electrons, these traits indicate that Cloud 1 will eventually create a star.
Given that cloud 2 won't produce stars, we can state the following about it: Due to gravity, its volume decreases and density rises, but its temperature remains above 14 million kelvin.
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Please see the screenshot below.
Thanks :)
Answer: option a
Explanation: humidity is moisture in the air the hotter the air is the hotter the moisture in the air will be which means it willbe hotter
Can mathematical representation support that momentum is conserved when there is no force on the object?
The momentum of a system is conserved when there is no external force applied on the object. This can be represented by mathematical expression: (m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂).
What is Momentum?
Momentum is a property of a moving object which the object has by the virtue of its mass and motion. It is the product of the body's mass and velocity.
Conservation of linear momentum expresses that a body or system of bodies in motion retains its total momentum. The product of mass and vector velocity constant, until and unless an external force is applied on it. In an isolated system, there is no external force, so momentum is always conserved.
To have the momentum conserved, a system must meet two requirements:
1. Total Mass of the system must remain constant during the interaction.
2. The net external force on the system must be equal to zero.
The mathematical expression for the conservation of momentum is:
(m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂)
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when making a suspension for inoculation, what broth is used and what is the required concentration in mcfarland units?
Suspension for inoculation of the bacteria to be tested is prepared in saline or Mueller–Hinton broth to the turbidity of a 1.5 x 108 cells/ml McFarland standard.
McFarland standards gives the reference to adjust the turbidity of bacterial suspensions so that the number of bacteria will be within the certain parameter. approximately a culture density should be around 1.5 x 108 cells/ml according to McFarland standards .
McFarland Standards are used to standardize the approximate number of bacteria in a liquid suspension by comparing the turbidity of the test. McFarland Standard contains a chemical solution of barium chloride and sulfuric acid.
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What is the purpose of tRNA? Answer choices:
A. It carries DNA to the ribosome.
B. It contains a sequence of transcribed DNA out of the nucleus.
C.It is the major part of the ribosome.
D. It transfers amino acids to the ribosome during protein sysnthesis.
Brainliest to first correct answer! Have a nice day^^ Ty
The main purpose of the the RNA is that It contains a sequence of transcribed DNA out of the nucleus.
What is the tRNA ?The term tRNA has to do with the kind of ribonucleic acid that is responsible for the process of transfers during the reproduction of cells. The term tRNA is the short form for the name transfer ribo nucleic acid.
The purpose of the transfer ribonucleic acids is that they are able to carry on the sequence of the DNA and this is how we can be able to transcribe the genetic information to the nucleus of the cell.
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the equilibrium potential for potassium is about -90 mv. if potassium channels remained open and all other ion channels were closed, the voltage inside a neuron would be
The voltage inside a neuron would be about +66mV.
Voltage-gated potassium ions (VGKC) are membrane channels that are responsible for repolarizing the depolarized cell after each nervous impulse. As a result, they play a key role in modifying neuronal activity in the CNS and the peripheral nervous system.
The potassium channels with two pore domains are made up of a dimer of protein, each with four transmembrane segments. These 'leaky channels' are always open, contributing to the plasma membrane's substantially increased permeability to K+.
Potassium channels participate in membrane repolarization, which occurs after depolarization by sodium and, in certain circumstances, calcium channels during in the nerve impulse; this is required for restoring the membranes to a negative resting state and terminating the action potential signal.
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which species interaction depends on prey density and effectiveness of prey defenses to determine the impact on the prey population?group of answer choicescompetitionmutualismconsumptioncommensalism
Prey density and the efficiency of prey defenses influence consumption species interaction, which has an effect on the prey population.
In basic terms, what is species?A species is a group of organisms made up of similar individuals capable of breeding or exchanging genes with one another. The most fundamental taxonomic rank and unit of classification in biology is the species. A genus is the taxonomic rank after an individual in the biological categorization system.
What is the best definition of a species?A species is frequently described as the biggest group of creatures capable of sexual reproduction, in which any two individuals of a right sexes or mating types can result in fertile offspring. The karyotype, DNA sequence, anatomy, behavior, and ecological niche are further methods of distinguishing species.
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what energy system is primarily utilized in an 300 meter run that is completed in 35 seconds? select one: a. oxidative b. immediate phosphagen c. anaerobic glycolyosis
The correct answer is anaerobic glycolysis.
Anaerobic glycolysis is the process by which glucose is converted to lactate when oxygen is limited.
Anaerobic glycolysis is only an effective energy generation method during brief, intensive activity, producing energy for 10 seconds to 2 minutes. Cells that are unable to generate enough energy through oxidative phosphorylation use anaerobic glycolysis as a substitute. Glycolysis generates 2 ATP in tissues with low oxygen levels by diverting pyruvate away from mitochondria and using the lactate dehydrogenase process. Anaerobic glycolysis provides for the more rapid synthesis of ATP in rapidly contracting skeletal muscle cells, where energy demand exceeds that which can be provided by oxidative phosphorylation alone. (Oxidative phosphorylation is around 100 times slower than glycolysis.) Pyruvate cannot undergo oxidative phosphorylation, regardless of oxygen levels, in cells that have no mitochondria at all.
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How far each of the following statements is correct with explanation: Spores of fern plant are produced due to mitosis
Answer:
did u know the answer
Explanation:
Is movement of carbon from living organisms to the atmosphere decreased
No, Carbon dioxide is increasing, as the combustion of fossil fuels for energy has led to an increase in the amount of carbon dioxide in the earth’s atmosphere.
What are fossil fuels?The components of fossil fuels are decaying plants and animals. These fuels may be burned to provide energy and can be found in the crust of the Earth. An example of a fossil fuel is coal, as well as oil and natural gas. Coal is a substance that is typically found in sedimentary rock formations, which are collections of rock, dead plant and animal materials, and layers of silt.
A chunk of coal must contain more than 50% fossilized plant material. Shale is one sedimentary rock type that contains oil in its native form. The thick oil that can be used to make gasoline is created by heating this substance. Typically, pockets of natural gas can be found atop oil deposits.
Gasoline has the chemical formula C8H18. It appears like this when you combine it with oxygen, or when you burn it: 2(C8H18) + 25(O2) = 16(CO2) + 18 (H2O). That’s a significant amount of CO2.
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when humans began to migrate and disperse around the globe about 70,000 years ago, why did that produce genetic changes in the dna of the various migrating populations? a. the original dna code was no longer useful in the new environments. b. they lived in different environments to which they had to adapt to survive. c. the food resources in different regions were different; thus, they could no longer get all the nutrients needed to create the original dna code. d. the animals consumed for food had different dna nucleotides and thus introduced mutations into the dna code of humans. e. the plants consumed for food did not have all of the vitamins and minerals necessary to maintain the original genetic code.
Option D. the animals consumed for food had different DNA nucleotides and thus introduced mutations into the DNA code of humans, producing genetic changes in the DNA of the various migrating populations.
Researchers say early people set out searching for climates wherein extra food was to be had. And some populations stayed installed certain places due to the fact limitations like glaciers blocked their development. humans migrated out of Africa because the climate shifted from moist to very dry about 60,000 years ago, according to an investigation led by way of a college of Arizona geoscientist.
Genetic studies indicate people migrated from Africa into Eurasia between 70,000 and fifty-five,000 years ago. As the migration wave travels thru them, it accumulates range, collecting new versions from each population via which it passes. for that reason, heterozygosity will increase with growing colony quantity within the equal way that it increases within the archaic admixture model on the population in which admixture happens.
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