Question

question 22
1 pts
a certain enzyme is known to be responsible for separating the two strands of a dna molecule to facilitate the process of dna replication. this enzyme most likely
forms covalent bonds between nucleotides.
breaks covalent bonds within nucleotides.
breaks hydrogen bonds between bases.
causes the dna to twist into a helix.

Explanation:

DNA strands are held together by hydrogen bonds between complementary bases (A - T, G - C). During replication, helicase (the enzyme in question) breaks these hydrogen bonds to separate the strands. Covalent bonds within nucleotides (like phosphodiester bonds in the sugar - phosphate backbone) or between nucleotides (not relevant here as they form the backbone, not between strands) are not broken by this enzyme. DNA already has a helical structure before replication, so that option is incorrect.

Answer:

breaks hydrogen bonds between bases.