Question

1. match each enzyme with its job:

______ helicase a. links dna fragments together
______ ligase b. makes rna primer as start point for dna polymerase
______ dna polymerase c. inserts new nucleotides using base pairing rules
______ primase d. unzips dna

Explanation:

• Helicase: Unzips DNA during replication by breaking hydrogen bonds between base pairs.
• Ligase: Links DNA fragments (e.g., Okazaki fragments on the lagging strand) together via phosphodiester bond formation.
• DNA polymerase: Inserts new nucleotides (complementary to the template strand) using base - pairing rules (A - T, G - C) during DNA synthesis.
• Primase: Synthesizes RNA primers. DNA polymerase needs these primers as a starting point (provides a free 3' - OH group) to begin adding nucleotides.

Answer:

helicase - d, ligase - a, DNA polymerase - c, primase - b