Botany-DNA Replication
NEET Botany DNA Replication MCQ Question
Type: MCQ-numerical-Medium-Class 12
If E. coli is allowed to undergo DNA replication for 40 minutes, what proportion of the DNA will be hybrid (containing both 'light' and 'heavy' DNA)?
A
25%
B
50%
C
75%
D
100%
Correct Answer
Option C
Detailed Explanation
According to the NCERT context, the DNA replication in E. coli follows a semi-conservative mechanism. After one round of replication (20 minutes), 50% of the DNA is hybrid. After a second round (40 minutes), half of the hybrid DNA will replicate to form new hybrid DNA, resulting in 75% of the DNA being hybrid.
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