To prove DNA replication is semi conservative Meselson and Stahl labelled DNA with N15, DNA sample appeared heaviest which was collected after.
Correct answer: A. 0 minutes
- A. 0 minutes
- B. 20 minutes
- C. 40 minutes
- D. 60 minutes
Explanation
Right after adding the N15 label, the DNA sample would contain only the heavy isotope N15, so it would appear heaviest at this point.
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About Structure of DNA
DNA structure includes nucleotides made of deoxyribose, phosphate and nitrogenous bases, arranged in two antiparallel polynucleotide strands. Questions cover the double helix, phosphodiester and hydrogen bonds, complementary base pairing between adenine and thymine and between guanine and cytosine, and the significance of major and minor grooves.
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