In semi-conservative replication, which of the following is true regarding the separation of two strands?
Correct answer: A. The primary structure is preserved, while the secondary structure is altered.
- A. The primary structure is preserved, while the secondary structure is altered.
- B. The secondary structure is preserved, while the primary structure is altered.
- C. Both the primary and secondary structures remain unchanged.
- D. Both the primary and secondary structures are disrupted.
Explanation
In semi-conservative replication, the DNA molecule separates into two strands, each serving as a template for a new complementary strand. This ensures that the primary structure, or the sequence of nucleotides, is conserved in each of the daughter molecules. However, the secondary structure, formed by hydrogen bonds between the two DNA strands, is temporarily disrupted during this process to allow the strands to separate and be replicated. Thus, the correct option is that the primary structure is preserved, while the secondary structure is altered. The other options are incorrect as they do not accurately describe the conservation of the primary structure and the disruption of the secondary structure during DNA replication.
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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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