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Practice MCAT Question - Q75

Chromosomes are visible during mitosis and meiosis when they condense and are tightly coiled. Yet, they cannot be seen as distinct units at other times in the cell cycle when their chromatin material is uncoiled. What reason best explains this phenomenon?

A.  They must uncoil to reveal genetic sequences during protein synthesis.
B.  They must uncoil to reveal all DNA sequences during replication.
C.  They must be tightly coiled for them to be moved around during cell reproduction.
D.  All of the above

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