Which molecule is active during the last step of DNA replication?

a. ThymineB) Helicase enzyme

c. nucleotidaseB) DNA ligase

Correct answer: Option D - DNA ligase

Explanation: Thymine is a nucleotide, so it is present throughout the replication process, wherever it is required. It is added to the newly formed DNA. Helicase enzyme is active during initiation and elongation stage, as it facilitates the opening of the winded DNA strands. Nucleotidase has no role in DNA replication. So, the correct answer is DNA ligase.

The okazaki fragments formed during DNA replication are sealed at the end. And in this step, DNA ligase is used. So it is the last active molecule of the process.