A gene pool is made up of every gene present in every individual of a specific species or community. Micro genetics is the scientific discipline that focuses on understanding transient evolutionary change within a particular species.
What is the term for when a species changes?In biology, evolution is the process through which new species arise over time from already existing ones. In genetics, evolution is any shift in the frequency of alleles in populations of organisms from generation to generation.
What is natural selection according to Darwin?Those that possess adaptive traits—traits that give them an advantage—are more likely to endure and procreate. The descendants of these individuals then inherit the adaptive qualities.
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a collection of recombinant vectors that contains fragments of one organism's entire genome is called a(n) .
A genomic library is a collection of individual genome fragments from one organism.
What types of organisms are examples?Any living thing that has an organized structure, is capable of reacting to inputs, can breed, expand, adapt, & maintain equilibrium is described to as an ecosystem. Therefore, anything animal, vegetation, fungus, parasitoid wasp, bacterium, and archaeon found on Earth would be considered an organism.
Sperm—is it a living thing?Sperm are alive? That mostly depends on how you define "life." Sperm cells share several traits with living things, such as the ability to grow (mature), make energy from sugar metabolism, and move independently.
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Review this illustration to answer the question.
Which structure is responsible for organizing spindle fibers during mitosis?
The stricture responsible for organizing spindle fibers during mitosis is the centriole. The third option.
What is mitosis?Mitosis refers to the division of non-sex or vegetative cells in the body of living organisms to produce two daughter cells.
The onset of mitosis is marked by the dissolution of the nuclear membrane and the condensation of the chromatin material located in the nucleus. Thus, the chromatin material becomes visible as chromosomes.
Simultaneously, the centrioles start giving off spindle fibers at the opposite ends of the cell. This stage of mitosis is referred to as prophase.
Thereafter, the chromosomes align at the center of the cell and the spindle fibers from the centriole engage each chromosome at the centromere. This stage is otherwise known as metaphase.
Next, the spindle fibers start shortening to pull apart sister chromatids to opposite poles. This is the anaphase.
The sister chromatids complete their migrations to the pole at telophase. Thereafter, the nuclear membrane reappears, the chromosome decondense, and the cytoplasm divide to give two independent daughter cells.
In other words, the structure responsible for organizing spindle fibers is the centrioles.
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enteropeptidase deficiency is an inborn error of metabolism that causes malabsorption of protein. the most likely explanation for this malabsorption is that in the absence of enteropeptidase, the only protease zymogen that could be converted to its active form is:
The only protease zymogen that could be converted to its active form in the absence of enteropeptidase is chymotripsinogen.
Trypsinogen is transformed into active trypsin by enteropeptidase, which also activates several pancreatic zymogens in addition to hydrolyzing a few peptide links in specific dietary proteins. Enteropeptidase is a crucial enzyme in the digestion of dietary proteins because of this, and its lack may cause severe protein malabsorption.
Trypsinogen, which is enteropeptidase's main substrate, undergoes a limited amount of proteolysis to release trypsin with catalytic activity. By limited proteolysis, trypsin then acts on the 4 other zymogens to release chymotrypsin, elastase, and carboxypeptidases A and B that are catalytically active.
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In tomato plants, having yellow fruit and dwarf vines is the recessive condition. Having red fruit and long vines is the dominant condition. A cross was done between two plants that were heterozygous for both traits.
What is the probability the offspring will have yellow fruit and dwarf vines?
Answer:
25% of offspring will have yellow fruit and dwarf vines
Explanation:
denoting that:
D - red fruit, long vines (dominant)
r - yellow fruit, dwarf vines (recessive)
parental phenotype: Red fruit 》 Red fruit
parental genotype: Dr 》 Dr
gametes: (D) (r) 》 (D) (r)
random fertilization: punnet square
D r
D DD Dr
r Dr rr
F1 generation phenotype: Red fruit 》 yellow fruit
F1 generation genotype: DD, Dr, Dr 》 rr
ratio: 3 : 1
percentage: 75% 》 25%
[ the symbol " 》" is used simply as a divider as if all the information were in a table]
the process by which a virus is taken up by a host cell as a result of the host cell's cytoplasmic membrane surrounding the virion to form a vesicle is called
Endocytosis is the process by which a virus is taken up by a host cell as a result of the host cell's cytoplasmic membrane surrounding the virion to form a vesicle.
Endocytic machinery, a sophisticated collection of vesicles and proteins, has been developed by cells to ingest substances. In response, certain viruses have learned how to manipulate the cell's endocytic machinery in order to access the cytoplasm or nucleus of the host cell, depending on the virus's chosen method of replication.
Step-by-step processes for endocytic entry of viruses include an attachment to the cell surface, receptor clustering, signaling pathway activation, production of endocytic vesicles and vacuoles, transport of viral payload to endosomal compartments, sorting, as well as escape into the cytosol.
For a virus to begin replicating, its genome must enter the host cells. Most viruses enter cells by endocytosis, while others can directly pierce the plasma membrane and inject their genetic material into the cytoplasm.
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which stage of urine production involves returning water, nutrients, and electrolytes to the blood stream?
Reabsorption is urine production that involves returning water, nutrients, and electrolytes to the bloodstream.
In the field of science, the process though which water, electrolytes, salts and nutrients are reabsorbed back into the plasma from the glomerulus is referred to as reabsorption.
The urine formed has essential electrolytes and nutrients that are required by the body of an individual. Hence, in the glomerular filtrate, these materials are reabsorbed back into the blood by the process of diffusion.
The urine left after reabsorption is sent to the bladder where it can be stored for some time before releasing it out of the body.
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as cells are pushed from the deeper portion of the epidermis toward the surface, multiple choice question. a) they divide continually. b) their supply of nutrients improves. c) they die. d) they become dermal cells.
As cells are pushed from the deeper portion of the epidermis toward the surface Option C. They die.
Your epidermis is the outermost layer of skin in your frame. It protects your frame from damage, keeps your frame hydrated, produces new pores and skin cells and carries melanin, which determines the coloration of your pores and skin.
The dermis in the main consists of keratinocytes (proliferating basal and differentiated suprabasal), which include 90% of its cells, however additionally consists of melanocytes, Langerhans cells, Merkel cells, and inflammatory cells.
The dermis and its waxy cuticle provide a defensive barrier against mechanical harm, water loss, and contamination. Numerous changed epidermal cells alter transpiration, boom water absorption, and secrete materials.
Three primary populations of cells are living in the epidermis : 1)Keratinocytes,
2) Melanocytes,
3) Langerhans cells.
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which of the following is not true of koch's postulates? group of answer choices it requires isolation of the causative agent it can be applied to fastidious organisms it requires inoculation into a healthy, but susceptible host the suspected causative agent must be present in every case of the disease
Option B. it can be applied to fastidious organisms but is not true of Koch's postulates.
Koch's postulates are four criteria designed to set up a causal dating among a microbe and an ailment. The postulates were formulated by using Robert Koch and Friedrich Loeffler in 1884, based on in advance ideas defined via Jakob Henle, and delicate and posted with the aid of Koch in 1890.
Robert Koch's postulates, posted in 1890, are fixed criteria that set up whether a particular organism is the purpose of a particular disorder. nowadays, Koch's postulates are taught in excessive school and college classrooms as an indication of the rigor and legitimacy of clinical microbiology.
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what enables electrical impulses to travel in a continuous cell-to-cell fashion in myocardial cells?
Only intercalated disks, thickened portions of the sarcolemma, enable electrical impulses to spread quickly in a continuous cell-to-cell fashion.
Myocardial conduction cells initiate and propagate the action potential that travels throughout the heart and triggers the contraction of blood . myocardial contractile cells constitute the bulk of the cells in the atrial and ventricles .
In side heart ,cardiac muscle tissue or myocardium , contains many cells that expand and contract in response to electrical impulses from the nervous system. These cardiac cells work in a manner that they produce the rhythmic and wavy contractions that is termed as heartbeat.
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3.How are organisms grouped into producers, consumers, and decomposers?
Where do you fall
Answer:
Food webs are models to show how organisms are related in an ecosystem based on how they get their energy. The main roles are producers, consumers, and decomposers?
Explanation:
Producers
Producers make their own energy through photosynthesis. All most all plants, But not all, are Producers.
Consumers can be divided into
Primary > Primary consumers get energy by eating producers. They are usually small animals, insects and herbivores.Secondary > Secondary consumers get energy eating primary consumers. Secondary consumers are usually predators.Tertiary > Tertiary consumers get energy by eating secondary consumers. Owls and birds of prey, bears and large predator's, and carnivores are usually tertiary consumers. Humans are also among the tertiary consumers.And lastly Decomposers
Decomposers get by breaking down dead organisms and returning nutrients to the soil. Decomposers are usually fungi-like-mushrooms and bacteria
blindness could result from damage to which cortex and lobe of the brain? (a) visual cortex in the frontal lobe. (b) visual cortex in the temporal lobe. (c) sensory cortex in the parietal lobe. (d) visual cortex in the occipital lobe. (e) cerebral cortex in the occipital lobe.
Blindness results from damage to: (d) visual cortex in the occipital lobe.
Visual cortex is the cortical region of the brain that receives, integrates and processes signals from the retina. It therefore helps in image formation. It largely consists of myelinated axons to fasten the process of signal transmission.
Occipital lobe is present at the posterior portion of the forebrain. It is located between the parietal and the temporal lobe. It is the primary vision processing portion of the brain. It is also the smallest in size. The lobe rests upon a thick tissue called tentorium cerebelli. It is also involved in some function other than vision.
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biological evolution (the evolution of living cells) differs from chemical evolution (the evolution of the molecules that make living cells) in that biological evolution would have been possible only after the development of
Biological evolution differs from chemical evolution in that biological evolution would have been possible only after the development of true cells.
Biological evolution, sometimes also called organic evolution, is the process by which species (made of living cells) evolved over a long period of time. It mainly resulted from mutation caused by physical, chemical, and biological mutagens.
Chemical evolution is the process that occurs due to changes in the molecules' structures. In this evolution, the biomolecules are subjected to changes in extreme conditions, thus increasing their complexity over time. These molecules interacted with each other, possibly gaining the ability to pass on genetic materials and reproduce, which leads to the origin of life on Earth.
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why might it be advantageous to add a preassembled block of 14 sugars to a protein in the er, rather than building the sugars chains step-by-step on the surface of the protein by sequential addition of sugars by individual enzymes?
An investigation into the different sugar (carbohydrate) molecules that cells connect to proteins. Glycoproteins are proteins that include carbohydrates.
What is the name of the procedure whereby a protein in the endoplasmic reticulum is given a sugar addition?The signal sequence is often separated from the protein when it emerges on the luminal surface of the ER membrane by an enzyme known as signal peptidase. additionally, in a procedure called glycosylation.
What is the term for the combination of a protein and a carbohydrate?Proteins with covalently attached carbohydrates are known as glycoproteins. Each and every living thing contains them, in both there are soluble and insoluble versions with various uses and characteristics. 1-3 Certainly.
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Answer all please I need it asap
1. A(n) _____________________ transports electrons, along with their energy, to another molecule.
2. What is the equation for photosynthesis?
3. In the __________________________, NADPH and ATP combine with carbon dioxide to produce sugars.
4. In the _________________________, light energy from the sun splits water and generates ATP and NADPH.
5. True / False: Chloroplasts are organelles found in the cells of heterotrophs.
6. True / False: Autotrophs need light in order to carry out photosynthesis.
Explanation:
1. Electron carrier
2. CO2 + H2O --> C6H12O6 + O2
3. Stroma
4. Thylakoid membrane
5. False
6. true.
hope it helps. :)
Which installation method is most likely to put your computer at risk of downloading a virus?.
Internet installation method is most likely to put your computer at risk of downloading a virus.
Understanding viruses in computers
Viruses are files that interfere with the operational system on PCs and laptops, if the laptop is exposed to a virus then automatically the laptop's performance will not be maximized, usually this form of virus interference such as the ability to load becomes slower / slower, the loss of files that we save suddenly , the laptop restarts repeatedly, if you are faced with a great virus sometimes the OS will be deleted, this will force us to reinstall the OS on the laptop.
What is called a virus in a computer is an annoying file, so every file that can interfere with the performance of the OS is a virus, this annoying file can be in the form of ordinary files that we intentionally store but are damaged, Worms, Trojan Horses, Spyware, and malicious malware that is installed either intentionally or not. Actually we don't need to be afraid of being too much with what is called a virus in a PC / laptop, as long as we want to take the anticipatory steps correctly, then the possibility of a virus can interfere with our laptop is very small.
Here's how to prevent and avoid viruses from entering your computer or laptop:
1.Use a compatible and bona fide antivirus, always update the antivirus;
2. If your computer or laptop is often used to browse the internet, then use an antivirus that has Internet Security features;
3.Activate Firewall on Windows that you are using;
4.Always update Security Update on Windows Security;
5. Do not get into the habit of storing data on drive C for too long;
6. Identify all the data that you store on the laptop, and immediately discard/delete if there is data that you do not recognize;
7. Delete registry files that are not needed regularly;
8. If you are going to transfer data from another device/device, try not to open it when it is still connected, so send/copy it directly and then disconnect the device/device;
9.Use cleaning tools like Ccleaner, TuneUp Utility, etc.
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which of the choices is/are secretions produced by the pancreas? select all that apply. bicarbonate ions to neutralize stomach acid methane from fermentation gastrin to stimulate hcl production trypsin for further protein digestion lipase for fat digestion
Trypsin to further breakdown proteins Lipase is used to breakdown fat. gastric acid can be neutralised by bicarbonate ions.
What are the three different sorts of acids?Acids are frequently divided into three primary groups. The first is binary acid, followed by oxyacid and carboxylic acid. All binary acids are represented by the symbol "H-A," which stands for a hydrogen connection to a nonmetal atom.
Why is it called acid?The word "acid," which refers to the sour flavour and pungent odour of numerous acids, derives from the Latin word acidus, which meaning "sour." Examples: Because acetic acid and water are diluted, vinegar has a sour flavour. Lemon juice includes citric acid, which gives it a sour flavour.
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the period is the length of time pathogens need to grow and multiply in food or the digestive tract before they can cause illness.
The incubation period is the length of time pathogens need to grow and multiply in food or the digestive tract before they can cause illness.
The time it takes for an illness to manifest after a person has been exposed to a disease-causing organism is known as the incubation period (such as bacteria, viruses, or fungi). When the disease's initial signs or symptoms manifest, the incubation period is over. Knowing an infectious disease's incubation period—the amount of time between exposure to the pathogen and the onset of symptoms—can be helpful in predicting an outbreak's timing, especially when infected people would be symptomatic and most likely to spread the disease.
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suppose 10 glucose molecules are formed during gluconeogenesis. calculate the amount of pyruvate, atp, and nadh molecules required.
2 Pyruvate molecules produce 1 molecule of Glucose. For producing 10 molecules of Glucose 2*10= 20 molecules of Pyruvate is required.
6 molecules of ATP is used for generating one molecule of Glucose. So for 10 molecules of Glucose, it will be 6*10= 60 ATP.
2 NADH molecules are used in gluconeogenesis to produce 1 Glucose molecule. So for 10 Glucose molecules, it will be 2*10=20NADH.
Gluconeogenesis is a manner that transforms non-carbohydrate substrates (which include lactate, amino acids, and glycerol) into glucose (parent 1). each lactate and alanine are first converted into pyruvate, which then enters the mitochondrion and is carboxylated to oxaloacetate (OAA) with the aid of pyruvate carboxylase (pc).
Gluconeogenesis is a metabolic pathway that consequences in the era of glucose from positive non-carbohydrate carbon substrates. it is a ubiquitous system, found in flora, animals, fungi, bacteria, and different microorganisms.
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what are the requirements for photosynthesis to occur? 2) why do some trees appear green during the spring and summer, but then red / orange / yellow in the fall? 3) what are two factors that cause pigments to move at different rates during paper chromatography?
The Three Domain classification system developed by Dr. Woese is based partly on
O sensitivity to antivirals.
0RNA sequences
O enzyme similarities
ODNA sequences
The Three Domain classification system developed by Dr. Woese is based partly on RNA sequences.
Based on variations in the ribosomal RNA (rRNA) nucleotide sequences, membrane lipid structures, and antibiotic sensitivity, organisms can be categorized into one of three domains. The Archaea, Bacteria, and Eukarya are the three domains.
Based on variations in the 16S ribosomal RNA (rRNA) structure, Woese categorized them. Using the variations in the nucleotide sequence of 16S rRNA molecules, Carl Woese of the University of Illinois (USA) suggested a phylogenetic taxonomy of bacterial species in 1987.
The traditional prokaryote-eukaryote division and the five-kingdom concept were both challenged, and the 3-domain classification system was offered as an alternative.
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which of the following is not a function of the digestive system? a.all of these are functions of the digestive system b.break down of food to smaller molecules c.take in food d.absorption of water, electrolytes, and other nutrients
All of the given options are the functions of digestive system. These are:
break down of food to smaller molecules.take in food.absorption of water, electrolytes, and other nutrients.Digestive system is the organization of organs, hormones and enzymes that work together to break down the complex biomolecules taken in the form of food into smaller soluble molecules. The organs involved in this are: mouth, throat, esophagus, stomach, small intestine, large intestine and the anus.
Electrolytes are the minerals inside the body that are present dissolved in the blood or other body fluids. They perform functions like balancing the water level of the body or the pH of the body.
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the quiescent phage genbome, whether it exists as a plasmid or integrated into the host genome, is referered to as a
The quiescent phage genome, whether it exists as a plasmid or integrated into the host genome, is referred to as a prophage.
A prophage is a bacteriophage genome this is integrated into the circular bacterial chromosome or exists as an extrachromosomal plasmid in the bacterial cells. Integration of prophages into the bacterial host is the function step of the lysogenic cycle of temperate phages.
Prophages are bacteriophage genomes included in the host genome. The collection of P. aeruginosa genomes contains numerous putative prophages (table I). primarily based on their sequences, some prophages may additionally appear energetic, but it isn't continually viable to reactivate them in vitro in laboratory conditions.
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in winter, some birds stand on frozen ponds and lakes. how do they prevent their feet from freezing while simultaneously preventing excessive heat loss?
Through the process of countercurrent heat exchange in their legs, they keep their feet from freezing while maintaining a temperature above zero.
An entire foot needs a lot of energy to stay warm. These birds, however, let the foot get close to freezing. Birds use a countercurrent heat exchange system, and blood is still given to the foot. The warm arteries transmit heat to the chilly veins. Heat is maintained in the core very well by this countercurrent heat exchange system. The foot doesn't freeze because of periodic surges in blood flow that allow a small amount of heat to enter.
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A patient sustained an electric shock when she accidentally touched live wires following a severe storm. The shock affected her urinary function and resulted in oliguria and uremia. How will the patient’s symptoms be treated if she develops anuria?.
Using theories of urinary system, we got hemodialysis is the method through which patient`s symptoms be treated of she develops anuria.
Hemodialysis, also called as haemodialysis, or simply dialysis, is a process of purifying the blood of a person whose kidneys are not working properly. This type of dialysis achieves the extracorporeal removal of the waste products such as creatinine and urea and free water from blood when the kidneys are in state of kidney failure. Hemodialysis is one of three renal replacement therapies (the others two being kidney transplant and peritoneal dialysis). A other method for extracorporeal separation of blood components such as plasma or cells is called as apheresis.
Hence, if the patient develops anuria, in that case patient`s symptoms be treated by the hemodialysis method.
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10. describe the activity and appearance of the coliforms on hektoen agar. name the ph indicator. what is the main use for hektoen agar plates? g
Answer:
isolation and culture of gram-negative enteric microorganisms
Explanation:
which statement(s) about the composition of biological membranes is(are) false? check all that apply.
Every intracellular membrane of a specific eukaryotic cell type (such as a hepatocyte) contains essentially the same combination of lipids and proteins.
What sort of cell might be considered eukaryotic?Eukaryotic cells are distinguished by their membrane-enclosed organelles and organized nucleus. Plants, animals, fungus, and protists are a few examples of eukaryotic cells. Their genetic material is organized by chromosomes.
How do eukaryotic cells appear?In eukaryotic cells, endoplasmic reticulum and other membrane-bound organelles such as the nucleus and mitochondria are present. Protozoa, fungi, plants, and mammals are among the species that make up the group of eukaryotic cells. They are real cells since they include a nucleus. Prokaryotic cells lack the level of complexity that eukaryotic cells do.
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which of the following characteristics of the structure of dna was determined directly from x-ray diffraction photographs of crystallized dna? question 7 options: the frequency of a versus t nucleotides the sequence of nucleotides the double helical structure the length of a given dna molecule
The following characteristics of the structure of DNA were determined directly from x-ray diffraction photographs of crystallized DNA is the double helical structure.
Early X-ray diffraction results showed that DNA is composed of two strands of helically twisted polymers. The observation that DNA is double-stranded is significant and provided one of the key clues leading to the Watson-Crick structure of DNA.
Fiber diffraction is a method for determining molecular structural information from X-ray scattering data. Rosalind Franklin used this technique to discover structural information in his DNA. In this experiment, the fiber is placed perpendicular to the trajectory of her X-ray beam. Rosalind Franklin's X-ray diffraction pattern of the DNA molecule provided important evidence that DNA has a double-helical structure.
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Which of the following can be classified as a producer?
A. Bear
B. corn
C. deer
D. snake
Answer:
B. Corn
Explanation:
Corn is considered a producer because corn meets the two primary characteristics of a producer. To start, producers make their own food so they can live. Corn is a plant that uses photosynthesis to take energy from the sun and make usable glucose for energy. Second, producers serve as a food source for consumers. All other answer choices are consumers.
Answer:
B. corn
Explanation:
A producer is an organism that makes its own food. In other words, it's an organism that can perform photosynthesis (plants). Since "corn" is the only organism that can perform photosynthesis, it is a producer.
What is the primary difference between the somatic nervous system and the autonomic nervous system?.
Answer:The somatic nervous system allows us to consciously control our skeletal muscles, and the autonomic nervous system controls activity that humans cannot consciously control, such as the pumping of the heart and the movement of food through the digestive tract.
The diagram below shows organisms in a food web.
The organisms labeled A are MOST likely
carnivores.
decomposers.
herbivores.
producers.
Answer:
i think its decomposer's but there all on pointing towards a so i think decomposers are the best choice
have a good day!
Explanation:
