In sea urchin DNA, which is double stranded, 17 % of the bases were shown to be cytosine (C). The percentages of the other three bases (G, A and T) expected to be present in this DNA are:
A
G−8.5%,A−50%,T−24.5%
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B
G−34%,A−24.5%,T−24.5%
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C
G−17%,A−16.5%,T−32.5%
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D
G−17%,A−33%,T−33%
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Solution
The correct option is DG−17%,A−33%,T−33% In a DNA of a particular species, the number of adenine(A) = thymine (T) and cytosine(C) = guanine(G). Percentage of C = G = 17% and the remaining 66% is shared by A and T i.e., A = T = 33%. Thus, C - 17%, G - 17%, A - 33% and T - 33%.