Question

In a human cell $2.2$ metre long thread of DNA distributed in:-

• A. One chromosome
• B. $23$ chromosome
• C. $X$ chromosome
• D. $46$ chromosome

Answer 1

The correct option is D $46$ chromosome

In a human cell with 46 chromosomes in its nucleus, there are approximately 6.4 billion base pairs. Each of these base pairs has a length of about 0.34 nm. Thus, the length of the total amount of DNA in a diploid cell would have a length of about 2.2 m.

So, the correct answer is '46 chromosomes'.