Single Choice

In sea urchin DNA, which is double stranded, 17 % of the bases were shown to be cytosine. The percentages of the other three bases expected to be present in this DNA are

AG - 17% , A - 33% , T - 33%
Correct Answer
BG - 8.5%, A - 50%, T - 24%
CG - 34%, A - 24.5%, T - 24.5%
DT - 17%, A - 16.5%, T - 32.5%

Solution

According to Chargaff’s rule all cellular DNAs, regardless of the species, number of adenosine residues is equal to number of thymidine residues which means that A=T; and the number of guanosine residues is equal to the number of cytidine residues; G= C. In the given question, there is 17% cytosine which means guanine percentage is also 17%. Thus, percent of G and cytosine = 34; percent of A+T= 100-34= 66; Adenine percent= 66/2= 33; thymine percent= 33. Thus, the correct answer is A.

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