The photograph above shows a single replicated chromosome (consisting of two sister chromatids) just prior to mitosis. Which is an accurate statement about what the chromosome contains?

Question

A. Two single-stranded DNA molecules.
B. One double-stranded DNA molecule.
C. Two double-stranded DNA molecules.
D. Many double-stranded DNA molecules.

Answer 1

The correct answer is C. Two double-stranded DNA molecules.

During the process of DNA replication, each chromosome consists of two identical sister chromatids, each of which contains a double-stranded DNA molecule. Thus, a single replicated chromosome is composed of two double-stranded DNA molecules.