Q46) A 340 Å long segment of DNA molecule has 20 thymine nitrogenous bases, what will be the number of guanine nitrogen bases in the same segment ? A) 10 B) 40 C) 80 D) 160

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Correct option: C

Explanation: If the segment of DNA has 20 thymine bases then it will 20 adenine bases.

So length covered by thymine base = 20 * 3.4 = 68 Å

Length covered by G-C will be 340 – 68 = 272 Å

Number of guanine will be 272/3.4 = 80

i

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