During DNA replication, the short DNA segments synthesised on the lagging strand are joined together by which enzyme?

1. On the lagging strand, DNA is made in short pieces called Okazaki fragments. 2. These fragments must be joined into a continuous strand. 3. The enzyme that joins them is DNA ligase. 4. Helicase unwinds the strands and DNA polymerase adds nucleotides, but neither joins the fragments, which rules out options A and D. 5. So the joining enzyme is DNA ligase, option B. _Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 18 Genetics "DNA Replication", p.275_