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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Chromosomes are DNA-protein structures that carry genes and become visible during cell division. Coverage includes chromatin, centromeres, sister chromatids, homologous chromosomes, chromosome number, and the distinction between diploid and haploid cells, with links to DNA replication, mitosis and meiosis.
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