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mamaluj [8]
3 years ago
10

Cells within the body work independently of one another and rarely have direct effects on other cells. True or False

Biology
1 answer:
erastova [34]3 years ago
8 0
That statement is false because cells work together
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The presence of variation in the size and shape of bacterial cells of the same species is known as _______.
Leno4ka [110]

Answer:

Correct answer is a pleomorphism

Explanation:

Some bacteria have the ability to change their shape and size which is called pleomorphism. The bacteria which change their shape and size are called pleomorphic bacteria.  

These bacteria change their shape due to the change in the external environment condition. For example, bacteria can from rod to coccus shape as their environmental condition changes.  

Some examples of pleomorphic bacteria are mycoplasma, some members of the Deinococcaceae family, helicobacter pylori, etc. So the correct answer is a.

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3 years ago
A protein is a polymer consisting of a specific sequence of
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Answer:

amino acids

Explanation:

one of the bases or examples of proteins

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3 years ago
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Immediately following the arrival of the stimulus at the axon terminal there is a short period called the ________ period during
slega [8]

Answer:

Immediately following the arrival of the stimulus at the axon terminal there is a short period called the latent period.

Explanation:

When a stimulus reaches the terminal of an axon, a period known as the latent period begins. This period has a short duration and during it it is possible to observe the blockage of new stimuli in the nerve fiber. Thus, the new stimuli fail to trigger an impulse and no muscle tension to be observed.

While the latent period is not finished, the neurotransmitter is released through the action of exocytosis that moves until it gets access to the receptor capable of activating the muscle cell.

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3 years ago
A host organism needs time, often days, to mount an immune response against a new antigen, but memory cells permit a rapid respo
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Answer:

The answer is <em><u>D. </u></em>

Explanation:

Viruses can evade the processing and presentation of antigens, for example by interfering with the expression of MHC class I proteins, although this increases their susceptibility to be detected by natural killer cells (NK). However, some members of the herpesvirus, papillomavirus, retrovirus, poxvirus and flavivirus families have also developed strategies to escape the attack of NK cells and promote their survival, inhibiting cell apoptosis. Finally, some pathogens often change surface antigens frequently, as in the case of influenza viruses (orthomyxovirus).

The human immunodeficiency virus (HIV) affects CD4 + T cells and degrades the host's ability to counterattack with a strong cell-mediated immune response. There are so many tactics of immune evasion used by HIV, which have so far hindered the development of an effective vaccine.

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A bibliography is essential in determining its
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Bibliography is essential in determining its content. I hope this helped
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3 years ago
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