Laid end to end, the DNA from all 46 chromosomes of one human cell would measure about:
ATwo millimetres
BTwo centimetres
CTwo metres
DTwo kilometres
Answer & Solution
Correct answer: C. Two metres
1. The strand is extraordinarily long compared with its width.
2. If the DNA from all 46 chromosomes in a human cell nucleus was laid out end to end, it would measure approximately two metres.
3. Its diameter, though, would be only 2 nanometres.
4. A typical human cell is about 10 micrometres across, so the DNA must be tightly packaged.
_Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 10 'Cell Reproduction', sections 10.1-10.5_
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