Eukaryotic- Like (Possessing a Defined Nucleus)cells Were Obtained from a Martian

question 27

Multiple Choice

Eukaryotic- like (possessing a defined nucleus) cells were obtained from a Martian soil sample. The nucleus was carefully isolated and the chromatin obtained. The fibers had a "beads on a string" appearance, suggesting some type of "histones." Following digestion with micrococcal nuclease, protein removal, and gel electrophoresis, DNA fragments were obtained that are multiples of 280 base pairs in length. Longer incubation with micrococcal nuclease prior to protein removal results in fragments 200 base pairs in length. The amount of DNA that is wrapped around the "core histones" is therefore

• A)480 base pairs in length.
• B)200 base pairs in length.
• C)360 base pairs in length.
• D)80 base pairs in length.
• E)Not enough information is given to determine the answer.

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