Q17 · Practice questionSimple familiar1 mark
QUESTION 17
During DNA replication, which enzyme joins adjacent Okazaki fragments into a continuous strand?
(A)
Helicase
(B)
RNA polymerase
(C)
DNA ligase
(D)
Restriction endonuclease
WORKED SOLUTION
1 markAnswer C
Answer
C
Working
DNA ligase seals breaks in the sugar-phosphate backbone between adjacent fragments. Helicase separates the strands and DNA polymerase synthesises new DNA.
Marking criteria
- Select C. [1 mark]
Practice question aligned to the current QCAA syllabus; review the worked solution and marking criteria.
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