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swat32
3 years ago
13

For a normal person, about how long does a cycle of sleep (from stage 1 to stage 4 and back again) last?

Biology
1 answer:
balandron [24]3 years ago
5 0
Hey You!

It lasts about 90 minutes for a normal person.
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What are some reasons for immunodeficiency?
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2 facts and 1 fib about Kingdom Animalia
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Explanation:

Cell Structure

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1325 Ft.

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a

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Students in Dr. Branch's physics class were calculating the average time required for an assortment of objects to fall from the
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Suppose that in another world, DNA does not undergo semiconservative replication, but instead a conservative mechanism is used.
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c. ¼ heavy, ¾ light

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DNA replication follows semi conservative model which means that both the strands separate during replication and the newly formed DNA molecule has one old and one new strand. If instead of semi conservative, conservative mechanism is used, old strands will not separate from each other and the two newly synthesised DNA strands will come together to form a DNA molecule.

Here the cells were first grown in heavy 15N medium so all the DNA molecules had 15N and thus were heavy. Then the cells were transferred to 14N medium where only lighter 14N were available for replication process.

In first generation, 14N DNA molecules were synthesised from 15N DNA molecules so 1/2 DNA molecules were 15N and other half were 14N. In the second generation, 14N molecules will give rise to new 14N molecules and 15N molecules will also give rise to 14N molecules hence 1/4 molecules will be 15N (heavy) and 3/4 will be 14N (light).  

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3 years ago
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