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  4. The distance between two consecutive DNA base pairs is 0.34 nm. If the length of a chromosome is 1 mm, the number of base pairs in the chromosome is approximately

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Q. The distance between two consecutive DNA base pairs is $0.34 \,nm.$ If the length of a chromosome is $1 \,mm$, the number of base pairs in the chromosome is approximately

KVPYKVPY 2010

Solution:

The distance between two consecutive DNA $bp$ is $0.34 \,nm$
The length of a chromosome is $1 \,mm = 10^6\, nm $
$\therefore $ The number of bases in $1 \,mm$
chromosome $=\frac{10^{6}nm}{0.34\,bp\, nm} $
$=2,941,176.47$
$=3$ million base pairs