The process of replication of DNA begins at:
Correct answer: D. One or more places where there is a specific sequence of nucleotides
- A. One place only without any specific sequence of DNA
- B. One or more places without any specific sequence of DNA
- C. Any place with the uncoiling of two strands of DNA
- D. One or more places where there is a specific sequence of nucleotides
Explanation
The process of DNA replication begins at one or more places where there is a specific sequence of nucleotides. These specific sequences where DNA replication initiates are known as the origins of replication. The DNA molecule is unwound, and the replication machinery assembles at these specific sites, allowing for the controlled and accurate duplication of the DNA. The presence of origins of replication ensures that DNA replication occurs at the right place and at the right time in the cell cycle. The exact locations of origins of replication vary between organisms, and the specific DNA sequence recognised at these origins can differ, but they are always specific and serve as starting points for DNA replication.
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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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