STANDARDZoology-Molecular Basis of Inheritance
STANDARD Zoology DNA Structure MCQ Question
Type: MCQ-conceptual-Medium-Class 12
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
A
G 17%, A 16.5%, T 32.5%
B
G 17%, A 33%, T 33%
C
G 8.5%, A 50%, T 24.5%
D
G 34%, A 24.5%, T 24.5%
Correct Answer
Option B
Detailed Explanation
Amount of cytosine = Amount of guanine. 17% = 17%. Amount of remaining base (A+T) = (100 – 35%) = 65%. Amount of A = Amount of T = 65/2 = 33%.
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