Assertion: Histone proteins are synthesised during S-phase.
Reason: Histone proteins are found associate with DNA to form bead-like nucleosomes.

Options

A. Both assertion and reason are true and the reason is a correct explanation of assertion.
B. Both assertion and reaso are true, but the reason is not the correct explanation of the assertion.
C. Assertion is true, but reason is false
D. Assertion is false, but reason is true

Answer

B

Explanation

Nucleosome is a structural, bead-likeunit of a eukaryotic chromosome composed of a short length of DNA wrapped around a core of histone proteins. It is the fundamental subunit of chromatin. Unlike most proteins, which are made continuoulsy throughout interphase, the histones are synthesised mainly is the S-phase (i.e., the DNA synthesis phase).