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Question

A single human cell has approximately _____ long thread of DNA distributed among its _____ chromosomes.

A
2 cm, 46
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B
2 metre, 46
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C
2 cm, 23
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D
2 metre, 23
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Solution

The correct option is B 2 metre, 46
A single human cell has approximately two-metre long thread of DNA distributed in each chromosome. During different stages of cell division, cells show organised chromosomes in the place of the nucleus. In a human cell with 46 chromosomes in its nucleus, there are approximately 6.4 billion base pairs. Each base pair has a length of about 0.34 nm. Thus, the length of the total amount of DNA in a diploid cell would be about 2.2 m.

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