easy biology question below first correct answer gets brainliest
14). Clonal selection and differentiation of B cells activated by antigen exposure leads to the production of ________. A) large quantities of the antigen initially recognized B) vast numbers of B cells with random antigen-recognition receptors C) long-lived erythrocytes that can later secrete antibodies for the antigen D) short-lived plasma cells that secrete antibodies for the antigen
Answer:
The correct answer is D) short-lived plasma cells that secrete antibodies for the antigen
Explanation:
Each B lymphocyte has an antigen receptor (BCR: B cell receptor), a surface immunoglobulin (IgM or IgD), that binds to specific domains of the antigen called antigenic determinants or epitopes. Only B lymphocytes with a high antibody affinity for the antigen, and which are capable of processing and presenting it, will be positively selected. In this contact between the two cells, an exchange of chemical signals takes place that leads to the activation, clonal proliferation and differentiation of B cells into two sister subclones: one of antibody-secreting plasma cells, and the other of memory primed B cells. Therefore, only these last positively selected B lymphocytes will survive, proliferate and differentiate into plasma cells, synthesizing and secreting antibodies of a single isotypic class, with a unique specificity and high affinity, improving the ability to adhere to the antigen and, thus , neutralize and destroy pathogens.
If Darwin knew of Mendel's work, how might it have influenced his theory of evolution? Do you think this would have affected how well Darwin's work was accepted?
Answer:
See explanation
Explanation:
According to Darwin, the determinant of the ability of species to thrive in their environment is their ability to develop favourable characteristics which enable them to survive in their environment. This ability to develop favourable characteristics is called natural selection.
These favourable characteristics are passed on from parents to offsprings and are responsible for the perpetuation of organisms having these favourable characteristics in comparison to other members of the same species.
In relation to Mendel's theory, these favourable characteristics could be regarded as Mendel's factors (currently identified as genes). These factors are units of inheritance passed on from parents to offsprings.
If Darwin had an idea of Mendel's work when he propounded his evolution theory, he could have modified his idea of favourable characteristics to imply genes. This would have made his idea more empirical than speculative and led to a faster world wide acceptance of his ideas.
help asap if possible!
what were the four key concepts of Darwin's theory of natural selection?
then explain how Lamarck's theory was different and why it got rejected over time?
Nitrogen is the most common element in the air. Why do bacteria play a role in the nitrogen cycle?
Explanation:
Bacteria play a role in the nitrogen cycle because:The bacteria’s helps in breaking down the organic materials which has nitrogen in it, and helps in giving the nitrogen back to the cycle. Bacteria helps in breaking down of the leaves and then it diffuses the nitrogen to the soil. Prokaryotes also plays an important role in the nitrogen cycle. The nitrogen fixing bacteria present in the root zone of plants basically in the soil, helps in conversion of the nitrogen into ammonia. Then the nitrifying bacteria converts the ammonia to the nitrites or can say nitrates.
Answer:
sorry I didn't know hahaha
Multiple species of lizard feed on insects in the Caribbean islands. One
species of lizard lives on the ground, while another lives on tree branches.
Which statement is true of these two lizard species?
A. They have adapted to different niches due to competition.
B. They have adapted to different niches due to predation.
C. They have a mutualistic relationship with the insect species.
O D. They have the same niche: the Caribbean islands.
The two species of lizards have adapted to different niches to avoid competition. Therefore, option"A" is correct.
What is an ecological niche?
An ecological niche is the particular habitat of a particular species in an ecosystem. The term was coined by Joseph Grinnell in 1917. The selection of a niche depends on the environmental condition, to avoid competition and availability of the food. The different types of niches are spatial niches, tropical niches, and hypervolume niches.
Habitat is defined as the coexistence of abiotic and biotic things. Examples of habitats are the ocean and forests. A niche whereas is an inclusive space occupied by species in a habitat.
The ecological niche is occupied by a species of organism to avoid competition.
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Suppose D were dominant and d were recessive, and you could label the D allele in the P generation with a radioactive substance that could be inherited over several generations. You create hybrids by mating your radioactive DD individuals to dd individuals. Finally, you cross two F1 individuals (with the Dd genotype). In 1,000 offspring, how many would you predict would be radioactive?
Answer:
750 offspring
Explanation:
The correct answer would be 750 offspring.
The D allele has been labeled with radioactive substance.
If you cross Dd and Dd:
Dd x Dd
DD Dd Dd dd
3/4 of the resulting offspring would have, at least, the D allele.
Hence, out of 1000 offspring,
3/4 x 1000 = 750
750 would possess the radioactive label.
Answer fast pleAse i really need the help
Answer:
Due to different reproduction methods.
Explanation:
Organisms from eubacteria, plantae and animal kingdom are used different reproductive strategies which leads to genetic diversity. Bacteria use asexual reproduction which produces identical offspring while on the other hand, plants and animals use sexual reproduction that produces offspring that is different from plants which leads to variation in the organism so that's why we can say that different reproductive strategies is responsible for genetic diversity.
1. Identify Study the picture of the cockroach to the
right and identify some characteristics that
you could use to describe a cockroach
Answer:
you should use the head and the body to describe a cockroach
Explanation:
The Krebs cycle is a series of chemical reactions that: Group of answer choices Metabolize acetyl-CoA and produce ATP, carbon dioxide, and hydrogen ions Metabolize lactate and produces pyruvate, ATP, and hydrogen ions Metabolizes water and produces ATP and hydrogen ions Metabolizes alcohol and produces ATP and water in the mitochondria Breaks fatty acids into two-carbon molecules
Answer:
Metabolize acetyl-CoA and produce ATP, carbon dioxide, and hydrogen ions.
Explanation:
Cellular respiration can be defined as a series of metabolic reactions that typically occur in the cells of living organisms, so as to produce energy in the form of adenosine triphosphate (ATP).
During cellular respiration, high energy intermediates are created which are then oxidized to make adenosine triphosphate (ATP). Also, the high energy intermediary products are produced at the glycolysis and citric acid cycle stage.
Glycolysis can be defined as a biological process that uses the energy released and stored during the Krebs cycle to form adenosine triphosphate (ATP). Thus, glycolysis is a series of chemical reactions that is typically used to break glucose into pyruvic acid.
Krebs cycle is also referred to as the citric acid cycle (TCA cycle) and it can be defined as a series of enzyme-catalyzed reactions used to release stored energy in most living organisms by metabolizing (oxidation) acetyl-CoA which are typically derived from proteins, carbohydrates, and fats.
This ultimately implies that, the Krebs cycle is a series of chemical reactions that metabolize acetyl-CoA and produce adenosine triphosphate (ATP), carbon dioxide, and hydrogen ions.
Describe the phases of mitosis and meiosis that are similar. What happens in these phases?
All wrong answers will be deleted and reported. Plz give me the right answer!! Meningitis causes inflammation of the:
a.)skin
b.)digestive tract
c.)respiratory system
d.)brain and spinal column
TY for your help
Answer:D.
Inflammation of the fluid and membranes surrounding your brain and spinal column.
Explanation:
7. You and your lab partner are doing an experiment in the physiology lab. Each of you has an isolated muscle cell and you are supposed to stimulate it with an electrode as soon as its absolute refractory period ends. Your partner has a cardiac muscle cell and you have a skeletal muscle cell. Which one of you will use your electrode more times in one minute
Answer: I will use the electrode on the skeletal muscle cell more times in a minute than my partner will.
Explanation:
Based on the information given, an electromyograph tracing can be used on order to know when to use the electrode for the scenario explained.
An electromyograph is simply a machine that is used for the detection and the recording of the electrical potential that's been generated by muscle cells when such muscle cells are activated.
Due to the fact that a skeletal muscle cell while my partner has a cardiac muscle cell, I'll have to use the electrode on the skeletal muscle cell more times in a minute than my partner will.
what happens to the space inside the bell jar when the stretchy rubber is pulled down?
Answer:
The cavity inside the bell jar is airtight. As the diaphragm is pulled down, the volume of the cavity increases
Answer:
The cavity inside the bell jar is airtight. As the diaphragm is pulled down, the volume of the cavity increases.
This causes an increase in pressure within the bell jar, the air rushes out of the balloons causing them to deflate.
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Which picture shows how an organism uses parental care to ensure the
continuation of its species?
B pictures lamo
:-)
Explanation:
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what is photosynthesis
Answer:
Photosynthesis is the conversion of light energy into chemical energy by plants and other creatures, which is subsequently released to fuel the organism's metabolic activities through cellular respiration.
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Hope it helps...
Have a great day!!
Answer:
the process by which the green plants use cardboard dioxide and water in the presence of Sunlight and chlorophyll to simple carbohydrates and release oxygen is called photosynthesis
In what ways is a eukaryotic cell similar to a city?
Answer: In many ways, the eukaryotic cell is kind of like a city. I will tell you what each of the organelles in a cell does. Your job will be to try to match each of the cell parts to the parts of a city and explain why they are similar. a) Golgi Apparatus: packages up proteins and labels them for distribution to other parts of the cell.
Each one, like the organs inside your body, fulfills a particular function that is required for the cell to stay alive. Consider the cells to be a miniature city. Because they all do similar jobs, the organelles could represent companies, places, or parts of the city.
What is a cell?Cells are the fundamental building blocks of all life. Gazillions of cells make up the human body.
They support the body's structure, absorb nutrients from food, convert those nutrients into energy, and perform specialized functions.
Each one, like the organs in your body, performs a specific function that is required for the cell to survive. Think of the cells as a miniature city.
Because cell city has jobs that a plant cell does not, it represents an animal cell. In cell city, we believe that a waste disposal plant performs the same function as lysosomes, an organelle found only in animal cells.
Thus, this way, a eukaryotic cell similar to a city.
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In terms of base nucleotides, explain the only difference between the DNA message for normal hemoglobin and the DNA message for sickle-cell hemoglobin.
Answer:
In the 1950s, Vernon Ingram demonstrated that the only structural difference between normal adult hemoglobin and sickle-cell hemoglobin is the replacement of glutamic acid with valine in the β-globin amino acid chain (Ingram, 1957; 1959).
its may help you ☺
llxXKHaNZaDaXxllwhat is/are the function(s) of the cell cycle?
Answer:
Yea it's DNA replication
Explanation:
From g00gle:
" The most basic function of the cell cycle is to duplicate accurately the vast amount of DNA in the chromosomes and then segregate the copies precisely into two genetically identical daughter cells. These processes define the two major phases of the cell cycle. "
a small ball has a volume of 17 ml and a mass of 39 g. what is the density of the ball
Answer:
The right answer is "2.30 g/ml".
Explanation:
Given:
Volume,
= 17 ml
Mass,
= 39 g
Now,
The density will be:
= [tex]\frac{Mass}{Volume}[/tex]
By substituting the values, we get
= [tex]\frac{39}{17}[/tex]
= [tex]2.30 \ g/ml[/tex]
PLZZ HELP
Phosphorus is mainly found in the environment stored in
A. the atmosphere
OB. legumes
C. mineral deposits
D. denitrifying bacteria
Answers: I think it’s a or c
Explanation:
which example best shows that the chemisty of water is helpful to plants
Biology B (CR) (ACC. Ed)(Dixon) / Principles of Evolution
3. How many total, non-unique alleles are there for each gene in a population of 250 humans?
A 125
B 1000
C 500
D 250
Answer:
C. 500
Explanation:
Each human has 2 alleles, which you do 250*2, getting 500
plants make glucose using energy from the sun and two molecules. which two molecules do they use ?
Match the seven major evolutionary trends in animal body organization to its definition. Body Symmetry Cellular organization Body segmentation Cephalization Digestive Tract Appendages Body Support System A. animal body shape, whether radial or bilateral symmetry B. a collection of cells or whether it has tissues, organs, and organ systems C. specialization of distinct body regions; repetitive units D. a concentrated sensory structure at the anterior end of the animal E. a single opening or two openings to take in food and/or eject waste F. legs, tentacles, antennae, and fins G. skeletons or hydrostatic structures
Answer:
The answer is below
Explanation:
Considering the seven major evolutionary trends in animal body organization against the available definition, here is the final answer to the question.
1. Body Symmetry - A. animal body shape, whether radial or bilateral symmetry
2. Cellular organization - B. a collection of cells or whether it has tissues, organs, and organ systems
3. Body segmentation - C. specialization of distinct body regions; repetitive units
4. Cephalization - D. a concentrated sensory structure at the anterior end of the animal
5. Digestive Tract - E. a single opening or two openings to take in food and/or eject waste
6. Appendages - F. legs, tentacles, antennae, and fins
7. Body Support System - G. skeletons or hydrostatic structures
Which of the following does not result in a cell with a new genetic
composition?
A.Conjugation
B.Transduction
C.Transformation
D.O Binary fission
Answer: D
Explanation:
Answer:
d. binary fission
Explanation:
a. direct contact transfer..so no
b. transfer by a virus...so no
c. transferred between microbial cells ... so no
d. asexual reproduction by a separation of the body into two new bodies ...so yes!
When Dr. Philip tierno conducted his experiment on the pillows , he wanted to know the connection between pillows and the allergy-causing germs. He was trying to answer the question, Do these pillows contain germs that contribute to the family allergies?
Answer:
Yes. That was the question he was trying to answer.
Explanation:
To conduct the experiment investigating the connection between pillows and disease-causing gems, Dr. Philip needs to ask himself whether the pillows that will be used in the research contain germs that contribute to allergies in a family. This question allows Dr. Philip to have the basis to start his research and come to a conclusion about the pillows used in the research. Furthermore, the research points directly to the main point of the story.
Answer:When Dr. Philip Tierno conducted his experiment on the pillows, he wanted to know the connection between pillows and the allergy-causing germs. He was trying to answer the question, Do these pillows contain germs that contribute to the family’s allergies?
Explanation:Edmentum
An amino acid analyzer is an instrument used to determine a. the sequence of amino acids in a polypeptide chain b. the presence of modified amino acids in a protein c. the identity of N-terminal and C-terminal amino acids in a protein d. the identities and relative amounts of amino acids in a protein
Answer:
d. the identities and relative amounts of amino acids in a protein
Explanation:
An amino acid analyzer is an automated machine that is used to determine the identities and quantities of amino acids in a given protein, peptide, and cellular samples. It makes use of the ion-exchange chromatography principle to determine the presence of amino acids. When the chromatogram is obtained, the relative amounts are then determined by the analyzer.
Since proteins are made of sequences of amino acids, the identities of proteins can also be obtained through this method. Ninhydrin, in the chromatographic column, reacts with the present amino acids under an ultra violet detector and is then observed at a wavelength of about 440 - 570nm.
A large protein that passes through the nuclear pore must have an appropriate A)sorting sequence, which typically contains the positively charged amino acids lysine and arginine. B)sorting sequence, which typically contains the hydrophobic amino acids leucine and isoleucine. C)sequence to interact with the nuclear fibrils. D)Ran-interacting protein domain. Multiple Choice
Answer:
A)sorting sequence, which typically contains the positively charged amino acids lysine and arginine.
Explanation:
Protein sorting refers to the cellular process by which proteins are transported to their corresponding localizations both inside or outside the cell. A nuclear localization sequence (NLS) is a short amino acid signaling sequence that is able to mediate the transport of proteins into the nucleus. The proteins that are 'tagged' by an NLS sequence can pass through the nuclear envelope via nuclear pores. This sequence (NLS) is typically composed of protein motifs consisting of positively charged lysine (Lys) and arginine (Arg) amino acid residues, which are exposed on the protein surface. In consequence, the NLS sequence is recognized by the importin α/β heterodimer receptor, which transports the NLS-tagged protein into the nucleus. It has been shown that the deletion of the NLS sequence disrupts nuclear import, whereas the fusion of non-nuclear proteins with NLS sequences represents a useful strategy to introduce proteins into the nucleus.
Explain the adaptations for root hair cell
Answer:
they have thin membranes to allow diffusion of substance for short distance
they are numerous to increase the surface area of absorption
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