Replication of DNA is characterised by:
(A) The direction of replication is 5' → 3'.
(B) Only template with 5' → 3' polarity is replicated.
(C) Replication is initiated at ori.
(D) DNA polymerase catalyses the process.
(E) The daughter molecule formed has one parental strand.
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → (A), (C), (D), (E)
(A) The direction of replication is 5′ → 3′. — True. DNA polymerase builds the new strand only in the 5′→3′ direction.
(B) Only template with 5′ → 3′ polarity is replicated. — False. Both strands are copied: continuously on the 3′→5′ template and in pieces on the 5′→3′ template.
(C) Replication is initiated at ori. — True. Replication starts at a definite place, the origin of replication.
(D) DNA polymerase catalyses the process. — True. The main enzyme is DNA-dependent DNA polymerase.
(E) The daughter molecule formed has one parental strand. — True. Replication is semi-conservative: each new DNA keeps one old strand and one new strand.