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Question

Calculate the number of nitrogen bases in E.coli, if the length of E.coli DNA is 1.36 mm.

A
4×106
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B
8×106
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C
2×106
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D
16×106
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Solution

The correct option is A 4×106
The distance between two base pairs is 0.34 X 109 m. The total length of DNA in E. coli is 1.36 mm.
Total length of DNA = the total number of base pairs x distance between two consecutive base pairs
Hence, total number of base pairs = total length of DNA / distance between two consecutive base pairs
= 1.36 / 0.34 X 109 = 4 X 106 base pairs.
Thus, the correct answer is '4 x 106.'

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