alleryHeavy-labelled E. coli enter ¹⁴N medium. After two DNA replications, which DNA types occur?
AOnly heavy
BOnly hybrid
CHeavy and light, equally
DHybrid and light, equally
Answer & Solution
Correct answer: D. Hybrid and light, equally
The first replication gives only hybrid DNA. In the second, each hybrid yields one hybrid and one light molecule, so the two types occur in equal amounts.
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