Answer:
Helper T cells are activated when they bind to their target antigen being displayed on an antigen-presenting cell. These cells then release what chemical? Cytokines, which is a chemical that signals B cells and other T cells to activate.
Helper T cells secrete cytokines to stimulate the proliferation of B cells.
What are Helper T- Cells?Helper T cells, also known as CD4+ T cells, are a type of white blood cell that play a critical role in the adaptive immune response. They are called "helper" cells because they help activate and coordinate other cells in the immune system, including B cells and cytotoxic T cells, to mount an effective response against a specific pathogen or foreign substance.
Helper T cells recognize and bind to antigens presented by antigen-presenting cells, such as dendritic cells, and then secrete cytokines that activate and differentiate other immune cells.
They also play a role in regulating the immune response to prevent excessive inflammation and tissue damage. Helper T cell dysfunction or depletion is associated with a number of autoimmune and infectious diseases.
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the number of phenotypes in a population is determined by
Answer:
The number of phenotypes produced for a given trait depends on how many genes control the trait.
Explanation:
Based on heredity, the number of phenotypes in a population is determined by the number of alleles for that triat as well as the nature of the alleles.
What is a phenotype?A phenotype is a physical expression of a gene.
The phenotype of an organism is influenced by the inherited alleles for that gene that an organism has.
Alleles are alternate forms of a gene.
Alleles may either be;
dominant,recessive, incompletely dominant or co-dominant.The phenotype of that organism will thus depend on the nature of the alleles of that gene or trait.
Therefore, the number of phenotypes in a population is determined by the number of alleles for that triat as well as the nature of the alleles.
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the three steps that are required for dna replication are
Replication occurs in three major steps: the opening of the double helix and separation of the DNA strands, the priming of the template strand, and the assembly of the new DNA segment.
The three steps that are required for DNA replication are initiation, elongation and termination.
What is DNA replication ?The process in which DNA of a cell under go duplication to produce two copies during S-phase of cell cycle called as DNA replication.
It involves 3 steps such as initiation step where the origin of replication of DNA molecule undergo unwinding into two DNA strands.
An incomplete unzipping by forming replication fork is created is catalyzed by the helicase enzyme.
Secondly in elongation step the DNA polymerase enzymes make the complementary sequence against each parent template strand.
It is an unidirectional, one strand which is synthesized in a continuous manner called leading strand, the strand which is synthesized in a discontinuous manner called lagging strand with Okazaki fragments.
Termination occurs in the last step, when the parent molecule has been completely replicated.
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How many mRNA codons are needed to make a protein that contains 5 amino acids?
a. 3
b. 5
c. 10
d. 12
Answer:
A.3
Explanation:
I got no explanation for this only thing i know is that 3 codes are needed as three basic is one codons maybe
which division of the nervous system controls the radial muscles of the eye?
Answer:
sympathetic.
Explanation:
Mitosis is a type of cell division. organize the images below to show the steps of mitosis.
(QUICK PLZ)
Answer:
i believe its the first
Explanation:
Lesson 1: Living Things Themes DRY MOUNT SPECIMEN PREPARATION Task # Direction: Study the procedures in column A and B. poste your accomplished improvise specimen Procedure How does it look like Your Tasks Yo work Prepare a slide, most microscope slides are flat on Cut the cardboard into 1 top and bottom and inch width and 3 inches in rectangular in shape. It is height. This will serve as transparent that allows the light pass on your slide Slice off a thin piece of the sample specimen. Use a razor blade to cut your specimen material into a thin, translucent slice In a colored paper cut a portion of it of l cm by 1 cm. In order to make a sample specimen Place the strip colored paper over the cardboard Place the sample specimen on the slide. Use a pair of forceps to pick up the thin slice of your sample specimen Set a cover slip over the mple specimen. The cover lip prevents the sample cimen from tumbling off the slide Using the transparent plastic, cover the sample. The plastic cover will serve as the cover slip of the sample
Answer:
I do not understand the question you are asking.
The tall allele is dominant and the dwarf allele is recessive. What is the abbreviation for the dwarf allele
Answer:
t
Explanation:
really just lowercase but I would you T,t because your talking about being tall or dwarf so you need to know that the T is tall and the t is dwarf
Hope this helped
I need help with one paragraph.
Answer:
paano nyo po ginawang dalawa po yung picture?
Explanation:
nakakonek ka po sa U.S.A dun po kayo sa Philippines po punta ka settings mo tapos pindutin mo yung change hanapin mo yung Philippines tapos pindutin mo,gumawa kana ng isang account mo,, Virtuoso na ako don,,,dadami followers mo,marami din sasagot sa question mo,marami din mamigay ng points
what is the purpose of a broth in a microbiology laboratory
In experiments with competitive barnacle species distributed along upper and lower intertidal zones, researchers found a trade-off between ability to _____ and ability to _____.
In this case, researchers observed a trade-off between the ability to tolerate harsh dry conditions and the ability to colonize deeper water. This type of trade-off can increase the fitness of only one phenotypic trait.
An evolutionary trade-off can be defined as an evolutionary mechanism where a trait can increase its adaptive fitness in the detriment of decreased adaptive fitness in another phenotypic trait.
In trade-offs, the evolutionary adaptive processes cannot optimize a given trait without compromising another.
A well-known example of an evolutionary trade-off is the balance between the number of eggs that a bird can produce in a determined clutch.
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Which of the following best describe a chemical property of a substance. *
A. the amount of material used
B. the ability of a substance to undergo chemical change
C. the behavior of material when heated
D. the color of the product
Answer:
Explanation:
option C
Chemical properties, such as combustibility, are generally observed as the identity of a substance changes and one or more new substances form.
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The Correct choice is ~ B
The ability of a substance to undergo chemical change
Which procedure will determine if water temperature affects the weathering of sedimentary rocks?
Answer:
Sedimentary.
Explanation:
Sedimentary will determine if water temperature affects the weathering of sedimentary rocks.
anthropologists are suspicious of naturalizing discourses because
Anthropologists are suspicious of naturalizing discourses because they ignore historical evidence showing how present-day arrangements contrast.
What are the roles of anthropologist?An anthropologist is a person engaged in the practice of anthropology. Anthropology is the study of aspects of humans within past and present societies.
Creating research plans that address underrepresented topics. Executing research protocols that adopt a holistic study design. Promoting the co-creation of information by employing participatory approaches.
Anthropologists, people who conduct anthropological studies, identify aspects of being human as their focus. For example, one anthropologist might explore mating rituals of a small tribe in New Guinea.
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Which part of the nerve cell houses the nucleus?
Answer:
B. Cell body is correct (second posting of THIS)
Explanation:
HOW did this answer get deleted? I'm posting again to see if it stays or is someone reporting correct answers? I highly recommend EVERYONE post CORRECT results to quiz let instead of this site
Describe prokaryotic cells. Include general characteristics and indicate the one feature that eukaryotic cells have that prokaryotic cells do not.
Please no links!
Answer:
prokaryotic cells — e.g. Bacteria
eukaryotic cells — e.g. Animal/Plant cells
Prokaryotic Cells are unicellular organisms that don’t have a nucleus, but have their DNA unbound (or uncompressed) within the cells cytoplasm, they also have circular structures (or rings) called plasmids which carry additional Genetic Information.
Specific Example: A bacterium is an example of a prokaryotic cell, and it has a cell wall, cell membrane, and even a capsule.
One feature that Eukaryotic cells have which Prokaryotic cells don’t is a Vacuole (this is just one feature).
Prokaryotic cells are much smaller than eukaryotic cells, have no nucleus, and don’t have organelles. Many also have a capsule or slime layer made of polysaccharide (ignore this word if you havent learn about it yet).
Mastication is performed by which of the following accessory digestive organs?
Answer:
d. All of the above
Explanation: is correct
classify the materials that undergo decay. write decay and non-decay in the space provided for
1. fish
2.stick
classify the materials that undergo decay. write decay and non-decay in the space provided for 2) stick
What is the correct abbreviation for pan troglodytes (chimpanzee)?.
Answer:
The correct abbreviation for Pan Troglodytes, which is the scientific name for chimpanzees, is PTR.
Explanation:
Hope this helps you :)
Almost end of semester, HELP!!
Specialized structures are expressed with the help of mRNA. What role does mRNA play? (5B)
Assisting with replication by producing glucose
Creating bonds to form large polymers
Providing information from DNA that is used to form proteins
Making energy available for cellular activities
Answer:
The answer is C Providing information from DNA that is used to form proteins
Explanation:
i took the test
The statement that demonstrates the role that mRNA play in protein synthesis is as follows:
It provides information from DNA that is used to form proteins.Thus, the correct option for this question is C.
What is Protein synthesis?Protein synthesis may be defined as a type of biological process through which polypeptide chains are formed from coded combinations of single amino acids inside the cell. The process of protein synthesis terminates with the help of two processes:
Transcription.Translation.The process of transcription involves the copying of a DNA sequence of a gene in order to make an RNA molecule. This RNA molecule is known as mRNA which determines the linkage of DNA from the manufacturing of the proteins. This process is carried out in the nucleus of the cell.
While the process of translation involves the synthesis of proteins using the genetic information carried in messenger RNA (mRNA). This process is carried out in the cytoplasm of the cell.
Therefore, the correct option for this question is C.
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where would the majority of the dna be located within a eukaryotic cell?
Answer:
cell nucleus
In eukaryotic cells, most DNA is located in the cell nucleus (though some DNA is also contained in other organelles, such as in the mitochondria and the chloroplast in plants). Nuclear DNA is organized into linear molecules called chromosomes.
Explanation:
Someone plz help me plzz :(
Answer:
C if i remember correctly
Explanation:
i did this yesterday for plant cell biology
Answer:
From what I see this is a cell and the part label Y is where the enzymes break down food so the closer answer would had been C
How do animals cause erosion.
Answer:
Some animals weather rocks by scraping them as they feed. Other animals change Earth's surface by burrowing into it and moving material. Too many animals in one place can destroy most of the plants, leading to faster erosion.
If too many animals graze the same land area, the animals’ hooves pull plants out by their roots. A land is overgrazed if too many animals are living there. Grazing animals can cause erosion if they are allowed to overgraze and remove too much or all of the vegetation in a pasture.
Explanation:
Hope this helped :)
A vaccine against HIV proteins made by a genetically-engineered vaccinia virus that has infected a eukaryotic cell line is a(n)
cuales son las adaptaciones para el ecosistema acuatico
Answer:
diseño aerodinámico, aletas
what modern day scientist use to learn the Ordovician Period
Rocks from the Ordovician Period contain evidence that plants began colonizing dry land at this time. Most experts agree that the ancestors of land plants first evolved in a marine environment, then moved into a freshwater environment and finally onto land.
Ordovician Period, in geologic time, the second period of the Paleozoic Era. It began 485.4 million years ago, following the Cambrian Period, and ended 443.8 million years ago, when the Silurian Period began. Ordovician rocks have the distinction of occurring at the highest elevation on Earth—the top of Mount Everest.
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examine the importance of your role as part of the family and community
Answer:
The important role of the family is communicating with each other, understanding,helping, and love my family
The important role of community help people how's need help, make my community clean and fresh
Hope it helps!
2. Organisms that are made up of more than one cell are called
a. viruses
b. bacteria
c. unicellular
d. multicellular
Answer:
Multicellular
Explanation:
They are composed out of more than one cell meaning it can't be unicellular. It can not be a virus or bacteria either because it is only identified as a cell made up of more than one cell, not the effects of what the cells do. Hope this helped!
Answer:
multicellular
learnt in school
how is metaphase produced?
Metaphase is a stage in the cell cycle where all the genetic material is condensing into chromosomes. These chromosomes then become visible. During this stage, the nucleus disappears and the chromosomes appear in the cytoplasm of the cell. ... As metaphase continues, the cells partition into the two daughter cells.
How many pairs of spinal nerves do you have?
Answer:
b. 31
Explanation: is correct
Michelle has been given a microscope slide that contains a eukaryotic cell and a prokaryotic cell. What should she look for to distinguish the eukaryotic cell from the prokaryotic cell?
A.
cytoplasm
B.
nucleus
C.
ribosomes
D.
cell membrane
Answer: B
Explanation:
