Question

multiple - choice question
which statement is correct?
the enzyme polymerase unzips the double helix by breaking the covalent bonds between the nitrogen bases.
the enzyme helicase unzips the double helix by breaking the hydrogen bonds between the sugar and phosphate groups.

Explanation:

In DNA replication, helicase is the enzyme that unzips the double - helix by breaking the hydrogen bonds between the nitrogen bases, not the covalent bonds between nitrogen bases (as stated in the first option) and not the hydrogen bonds between sugar and phosphate groups (as stated in the second option).

Answer:

Neither statement is correct.