Question

The length o f DNA in a human cell is about

• A. 2.3 m
• B. 2.4 m
• C. 2.2 m
• D. 2.0 m

Answer 1

Answer: (C)

The length of DNA in a human cell is about $2.2m$.
It can be calculated as
The distance between two consecutive base pairs
$=0.34nm$ or $0.34\times 10^{-9}m$
If the length of DNA double helix in a typical mammalian cell
$=$ The total number of bp $\times$ Distance between two consecutive bp
$=6.6\times 10^{9}bp\times 0.34\times 10^{-9}m/bp=2.2m$