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GrogVix [38]
3 years ago
13

1. What is the most important mutation that led to human life? ​

Biology
1 answer:
lina2011 [118]3 years ago
6 0

Answer:The ultimate source of all genetic variation is mutation. Mutation is important as the first step of evolution because it creates a new DNA sequence for a particular gene, creating a new allele. Recombination also can create a new DNA sequence (a new allele) for a specific gene through intragenic recombination.

Explanation:

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In the eastern region of the former Soviet Union, a railroad was built on the tundra. The surface soil was dug up and tracks wer
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<span>When the surface layer was dug up, the permafrost was exposed. When the weather warmed, this exposed permafrost would have melted and become soggy, causing the ground underneath the tracks to shift.</span>
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What are the three possible combinations of alleles?<br><br> (PLEASE HELP)
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Explanation:

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3 years ago
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If you sort your results by relevance, what will be at the top of the results list?
Lina20 [59]
<span>Actually the information or data in the catalog DB or data base connection takes place by relevance and then mainly here we get the search string or required data which we want or entered, with clear exact search filters which has been directly chosen, and hence these will be at the top of the results list for sure.</span>
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3 years ago
Would the correct protein be made if TRNA did not work correctly?
galina1969 [7]

Answer:

The short answers are Yes, it's random, and Yes, it "waits" for some time.

Different tRNA's just float around in the cytoplasma, and diffuse more or less freely around. When one happens to bump into the ribosome, at the right spot, right orientation, and of course which has an anticodon matching the codon in frame of the mRNA being translated, it gets bound and takes part in the synthesis step that adds the amino acid to the protein that is being synthesized.

The concentration of the various species of tRNA is such that translation occurs in a steady fashion, but there is always some waiting involved for a suitable tRNA to be bound. In that waiting time, the ribosome and mRNA stay aligned - that's because the energy that is required to move the to the next position is delivered as part of the same chemical reaction that transfers the amino acid from the tRNA to the protein that is being synthesized.

I'm not entirely sure what happens if there is significant depletion of a particular species of tRNA, but I think it's likely the ribosome / RNA complex can disassemble spontaneously. But spontaneous disassembly can't be something that occurs very easily after translation was initiated, since we would end up with lots of partial proteins which I expect would be lethal very soon.

(Can't know for sure though, but it would be very hard to set up an experiment to measure just what will happen and even if you got a measurement it would be hard to figure out how it applies to normal, living cells. I can't imagine tRNA depletion occurs in normal, healthy living cells.)

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3 years ago
A blood disorder caused by a lack of iron and red blood cells is called
vekshin1
Anemia is a blood disorder caused by a lack of iron and red blood cells.

Anemia impedes the production of protein hemoglobin in the body because of the absence or lack of the mineral iron in the blood. Iron is needed to produce the protein hemoglobin which in turn helps the red blood cells carry oxygen from the lungs and transport it all throughout the body.
5 0
4 years ago
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