Answers Biology A Unit Test — Unit testQuestion 13

13

QuizMultiple Choice

Unit Test — Unit test

Question 13 • Biology A

Which best describes a centromere?

Answer

A

sister chromosomes that are held together by a chromatid

B

paired chromosomes that have genes arranged in the same order

C

the part of a chromosome that joins the sister chromatids

D

the material that makes up a chromosome

Explanation

A centromere is the region of a chromosome where the two sister chromatids are joined. Therefore, the best description is “the part of a chromosome that joins the sister chromatids.” Choice A reverses the relationship: chromatids are joined at the centromere.

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