In the biology lab, you observe three different animal cells under a microscope. in one cell, the nucleus is uniformly filled, with no distinct chromosome structure visible. in another, you see the nucleus with two nucleolus areas of more compact chromatin. a third cell is in mitosis, and distinct chromosome strands are visible. the value in packaging dna in tighter forms of chromatin is for

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11-11-2017
Biology

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In the biology lab, you observe three different animal cells under a microscope. in one cell, the nucleus is uniformly filled, with no distinct chromosome structure visible. in another, you see the nucleus with two nucleolus areas of more compact chromatin. a third cell is in mitosis, and distinct chromosome strands are visible. the value in packaging dna in tighter forms of chromatin is for

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davidsilva2019 davidsilva2019 · Answer 1 · 2017-11-21T14:12:26+01:00

I found the whole exercise with the options for it. Here are the options:
"A. mobility and protection of the DNA molecule during mitosis.
B. prevention of ligase enzyme action during replication.
C. Both answers regarding DNA mobility, protection and regulation in mitosis and transcription are correct.
D. regulation and protection of the DNA during transcription.
E. ensuring that sister chromatids will be attached prior to replication."

Correct answer: C.
Both A. and D. are correct reasons for what is the value in packaging DNA in tighter forms of chromatin. By having a more compact DNA it is easier to move it and protect each bit of it as it is being processed during mitosis, going from one side to the other, separating sister chromatids, etc. Also, by compacting and releasing DNA it is easier to regulate and protect DNA as it is being expressed - the parts that are being transcripted are not packed while those that are not being transcripted are packed.