Question

which molecule is active during the last step of dna replication? a. nucleotidase b. helicase enzyme c. thymine d. dna ligase

Explanation:

DNA ligase seals the nicks in the sugar - phosphate backbone of newly synthesized DNA strands during the final step of DNA replication. Nucleotidase is involved in nucleotide breakdown, helicase unwinds DNA at the start of replication, and thymine is a nitrogen - base in DNA, not directly active in the last step of replication.

Answer:

D. DNA ligase