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WARRIOR [948]
3 years ago
15

Some cells live for years, while others live for only a few days. Why do some cells get replaced faster than others?

Biology
1 answer:
Vladimir [108]3 years ago
7 0

Answer:

<em>Some </em><em>cell</em><em>s</em><em> </em><em>don't </em><em>divide </em><em>and </em><em>last </em><em>you </em><em>a </em><em>life </em><em>time </em><em>such </em><em>as </em><em>many </em><em>of </em><em>those </em><em>in </em><em>the </em><em>central </em><em> </em><em>nervous</em><em> </em><em>system </em><em>other </em><em>c</em><em>ells </em><em>such </em><em>as </em><em>stems </em><em>called </em><em>cell </em><em>population</em><em>s</em><em> </em><em>have </em><em>their </em><em>telemeres </em><em>repeatedly</em><em> </em><em>exten</em><em>d</em><em>ed </em><em>by </em><em>the </em><em>enzyme </em><em>telomerase </em><em>other </em><em>cells </em><em>are </em><em>never </em><em>repla</em><em>c</em><em>ed </em><em>and </em><em>live </em><em>as </em><em>long </em><em>as </em><em>we </em><em>do </em><em>.</em>

<em><u>I </u></em><em><u>hope this </u></em><em><u>answer </u></em><em><u>might </u></em><em><u>help</u></em><em><u> </u></em><em><u>u </u></em>

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Indicate whether each of the following descriptions better applies to receptor-mediated endocytosis (R), phagocytosis (F), pinoc
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Answer:

PRFM

Explanation:

  • Receptor-mediated endocytosis is a process where cells absorb proteins, hormones, metabolites and sometimes viruses with the formation of an invagination (inward budding of the plasma membrane). Cholera toxin, flu viruses, and diphtheria have sites that cross-react with receptor-binding sites and gain entry into cells through this pathway. <em>Pathogenic particles such as SV40, papillomavirus, and cholera toxin enter the cell via this pathway.</em>
  • Phagocytosis is when a cell ingests or engulf large cells (up to 0.5 µm) or small particles to remove them from circulation. Neutrophils and Macrophages are an example of cells that phagocyte.<em> In animals, this pathway is normally limited to professional cells such as neutrophils.</em>
  • Pinocytosis, also known as fluid endocytosis is the process by which liquid droplets are ingested by a cell. Potocytosis is a variation of pinocytosis, the vehicle for internalization is the caveola, an invagination formed by proteins called caveolin. <em>This pathway depends on caveolin and cavin proteins.</em>
  • Macropinocytosis is the engulfment and uptake process of large amounts of fluids by the appearance of numerous irregular ruffles that eventually collapse towards the cell membrane, enveloping the content. <em>This pathway proceeds by the formation of highly ruffled regions in the plasma membrane which then collapse, resulting in fluid uptake.</em>

I hope you fidn this information useful and interesting! Good luck!

7 0
3 years ago
What color is blood while it’s in your body ?
Dennis_Churaev [7]

Answer:

Red, shade of red may depend on the oxygen level in it.

Explanation:

3 0
3 years ago
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What would happen to the insulin molecule if the amino acid were assembled in a different order
Korvikt [17]

Answer:

The correct answer would be the loss of its function.

Being protein in nature, the function of insulin depends on the amino acid sequence of the polypeptide chains.

Change in the amino acid sequence may result in a change of shape or structure of the protein.

Consequently, it would not be able to interact with cell surface receptors.

Thus, it would lose its function.

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Which element is not represented in the star spectrum below?
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D. Magnesium

Explanation:

good luck.......

7 0
3 years ago
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A scientist crosses a rabbit with short fur and a rabbit with long fur. which of these outcomes would show that the trait for fu
maks197457 [2]

Answer:

d. all of the offspring have medium length fur.

Explanation:

Incomplete dominance is a phenomenon in which offspring produce a trait that is intermediate between the two forms of a certain trait.

For example: In four o clock plant, some plants produce red flowers while some plants produce white flowers. When plants with red flowers are crossed with plants with white flowers, all the offspring have pink flowers.

Why is that so?

This is because no allele is completely dominant over the other and therefore both contribute their individual effect by producing intermediate phenotype.

Example in question:

Cross between a rabbit with short fur (SS) and a rabbit with long fur (LL)

P1:                                SS        x        LL

Gametes:                     S     and  L

Offspring                        SL :SL

SL: Medium length fur

Therefore this is a case of incomplete dominance.

Hope it help!

7 0
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