Botany-DNA Replication
NEET Botany DNA Replication MCQ Question
Type: MCQ-numerical-Easy-Class 12
If a double-stranded DNA molecule has 30% thymine, what is the percentage of guanine present?
A
20%
B
30%
C
40%
D
60%
Correct Answer
Option A
Detailed Explanation
According to Chargaff's rules, the amount of adenine equals thymine and guanine equals cytosine. If thymine is 30%, adenine is also 30%, totaling 60% for A and T. Therefore, guanine and cytosine together make up 40%, with guanine being 20%.
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