In a labeled DNA replication fork diagram, enzyme 'A' is:
Correct answer: B. Helicase
- A. Ligase
- B. Helicase
- C. Primase
- D. Polymerase
Explanation
Helicase is the enzyme responsible for unwinding and separating the two strands of the DNA double helix at the replication fork, creating single-stranded templates for replication. Ligase joins fragments, primase synthesizes RNA primers, and polymerase adds new nucleotides.
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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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