In a Biology Lab Exercise,you Are Asked to Examine Cells

question 20

Multiple Choice

In a biology lab exercise,you are asked to examine cells of a growing onion root tip,that has been sectioned to show many cells.In most of the cells,you easily see the circular or oval nucleus as a uniformly filled space in a membrane outline.In a small percentage of cells,you see chromosomes as distinct strands just as cell division begins,and as it progresses,because the chromatin

• A) becomes more tightly folded, increasing their visible length.
• B) becomes less tightly folded, increasing their visible length.
• C) becomes less tightly wound, to facilitate cell division.
• D) becomes more tightly wound, to protect DNA, and to more easily manage cell division.
• E) increases in length, as replication adds DNA sections to the original.

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