Replication progresses at a rate of about 50 base pairs per second in:
Correct answer: C. Eukaryote
- A. Bacteria
- B. Virus
- C. Eukaryote
- D. All of the above
Explanation
In eukaryotes, such as humans, DNA replication occurs at approximately 50 base pairs per second. This slower rate compared to prokaryotes is due to the complexity of eukaryotic chromosomal structures and the presence of multiple origins of replication. Bacteria replicate at a much faster rate of about 1000 nucleotides per second due to their simpler circular DNA and fewer regulatory complexities. Viruses do not have a fixed replication rate as it varies significantly depending on the virus type and the host cell machinery they exploit. Therefore, the correct answer is C: Eukaryote.
This question appeared on the ETEA MDCAT 2013 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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