Meselson and Stahl found that the DNA collected immediately after transfer was dense because:
Correct answer: B. Both strands contain N15
- A. Both strands contain N14
- B. Both strands contain N15
- C. One strand is N14 and other N15
- D. All of the above
Explanation
This is the correct option. Meselson and Stahl found that after one round of DNA replication in a medium containing only N14, the DNA molecules were hybrids, with one strand containing N14 (the newly synthesized strand) and the other containing N15 (the original parental strand). This resulted in a DNA molecule of intermediate density.
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