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abruzzese [7]
3 years ago
11

When an object is already in motion, why is energy required to stop it

Biology
1 answer:
harina [27]3 years ago
6 0

Newton’s Law. Either meet with opposite same momentum, or transfer that momentum to another body.
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CD4 and CD 8 are _______. A. proteins secreted by antigen-presenting cells B. receptors present on the surface of natural killer
kirill115 [55]

CD4 and CD 8 are molecules present on the surface of T cells where they interact with major histocompatibility (MHC) Molecules.

CD4 and CD8 improve T cell signalling by attaching to MHC class II (CD4) or MHC class I (CD8) molecules on APCs.

  • The association of CD4 with MHC class II significantly decreases the number of antigenic peptides necessary for T cell activation (5) and significantly boosts cytokine output by helper T cells.

The MHC molecules' wide polymorphism is their distinguishing trait.

  • This polymorphism is crucial for T cell antigen recognition.
  • A T cell detects antigen as a peptide bound by a specific allelic variation of an MHC molecule and will not identify the identical peptide bound by other MHC molecules.
  • This type of T cell activity is known as MHC limitation.

Hence, the correct answer is option C

Learn more about MHC here,

brainly.com/question/13259839

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2 years ago
When is a test cross used?
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A test cross is used<span> to determine if a group exhibiting a dominant trait is homozygous or heterozygous for that trait.</span>
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Each year, an average person in the United States is exposed to a radiation level of _____.
Bond [772]
The average person in the U.S. is exposed to a radiation level of .62 rem
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"pollination is an external process" give reasons
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Answer:

Pollination is an external process. Pollination agents are wind, water, birds, insects, and other animals. Fertilization takes place by growing pollen tube which enters the ovule. External factors are required

pls give brainliest for the answer

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A populationof arctic hares burrows into the snow for shelter. It is found that the hares on the smaller side are able to burrow
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This answer is C. Disruptive selection

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