Botany-DNA Replication
NEET Botany DNA Replication MCQ Question
Type: MCQ-numerical-Hard-Class 12
If a double-stranded DNA contains 30% of thymine, what is the percentage of guanine present?
A
20%
B
30%
C
40%
D
50%
Correct Answer
Option A
Detailed Explanation
According to Chargaff's rules, the amount of adenine equals thymine and the amount of guanine equals cytosine in DNA. Therefore, if thymine is 30%, adenine is also 30%, leaving 40% for guanine and cytosine combined, which means guanine is 20%.
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