The experimental material in the study of DNA replication has been:
Correct answer: A. Escherichia coli
- A. Escherichia coli
- B. Neurospora crassa
- C. Pneumococcus
- D. Drosophila melanogaster
Explanation
The experimental material in the study of DNA replication has been Escherichia coli. E. coli fully labelled with 1 N is allowed to grow in a 14N medium. The two strands of the DNA molecule of the first-generation bacteria have different densities and do not resemble their parent DNA. Meselson and Stahl, in 1958, by using 14 N and 15 N confirmed that the replication of DNA in E. coli is semiconservative in nature.
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About Chromosomes
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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