Botany-DNA Replication
NEET Botany DNA Replication MCQ Question
Type: MCQ-numerical-Medium-Class 12
If a double-stranded DNA molecule contains 30% thymine, what percentage of guanine does it contain?
A
20%
B
30%
C
40%
D
50%
Correct Answer
Option A
Detailed Explanation
According to Chargaff's rules, in a double-stranded DNA molecule, the amount of adenine equals thymine, and the amount of guanine equals cytosine. If thymine is 30%, adenine is also 30%. This leaves 40% for guanine and cytosine combined, meaning guanine must be 20%.
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