Question

multiple choice question
which step begins the process of dna replication?

enzymes join the added nucleotides into a new strand.
two dna strands combine to form a double helix.
new nucleotides are added using complementary base - pair rules.
hydrogen bonds between nitrogenous bases break.

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Explanation:

DNA is a double - stranded molecule held together by hydrogen bonds between nitrogenous bases. For replication to start, these bonds must break to expose the single - stranded templates. The other options occur later in the replication process.

Answer:

Hydrogen bonds between nitrogenous bases break.