Question

multiple choice question
in the first step of mrna synthesis, an enzyme called ____ binds to a(n) ____ at the beginning of a gene.

o atp synthase; initiation site
o dna polymerase; promoter sequence
o rna polymerase; initiation site
o rna polymerase; promoter sequence

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Explanation:

In mRNA synthesis (transcription), RNA polymerase is the enzyme that initiates the process. It binds to the promoter sequence, a specific DNA - region at the start of a gene, to start transcribing DNA into mRNA. ATP synthase is involved in ATP production, not mRNA synthesis. DNA polymerase is for DNA replication, not transcription. The correct binding site for RNA polymerase is the promoter sequence, not just an initiation site (which is a more general term).

Answer:

RNA polymerase; promoter sequence