Replication of D.N.A occurs in:
Correct answer: A. Interphase
- A. Interphase
- B. Prophase
- C. Metaphase
- D. Anaphase
Explanation
The correct answer is Interphase. During interphase, the cell prepares for division, and the DNA in the nucleus replicates. This phase includes the G1 phase (cell growth), the S phase (DNA synthesis), and the G2 phase (preparation for mitosis). The other options, Prophase, Metaphase, and Anaphase, are all stages of mitosis where DNA replication does not occur; instead, they involve the organization and separation of already duplicated chromosomes.
This question appeared on the ETEA MDCAT 2012 paper, which you can sit online with every answer explained.
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DNA structure includes nucleotides made of deoxyribose, phosphate and nitrogenous bases, arranged in two antiparallel polynucleotide strands. Questions cover the double helix, phosphodiester and hydrogen bonds, complementary base pairing between adenine and thymine and between guanine and cytosine, and the significance of major and minor grooves.
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