OBJECTIVE LIFE SCIENCE
MOLECULAR BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Meselson and Stahl conducted experiments using the isotopes 14N and 15N which showed that DNA replication is semi-conservative. What would they have observed about the distribution of isotopes in the DNA after one round of replication if DNA replication was conservative rather than semi-conservative?
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Only 14N DNA
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Only 15N DNA
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All DNA half 14N and half 15N
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Half the DNA with only 14N and half with only 15N
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Explanation:
Detailed explanation-1: -The starting double helix is fully labeled by nitrogen-15 (generation 0). Replication of this helix produces two helices that each contain one nitrogen-15 (old) and one nitrogen-14 (new) strand (generation 1).
Detailed explanation-2: -The heavier strand represents the parents stand and the lighter is the new one synthesized from the culture indicating the semiconservative mode of DNA replication. This proved semiconservative mode of DNA replication.
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