Question

The largest normal metaphasic chromosome has a size of

• A. $1\mu m$
• B. $10\mu m$
• C. $20\mu m$
• D. $30\mu m$

Answer 1

Answer: (D)

$30\mu m$

The largest normal metaphasic chromosome has the size of 30nm with the base of the nucleosome core particle consists of the 146 base pairs of DNA. During metaphasic state, when a chromosome in its most condensed state can range in size between 130,000 base pairs in the endosymbiotic bacteria, then the chromatin can be further condensed by coiling into 30nm in fibres.
So, the correct answer is option D.