Question

what role does the enzyme dna polymerase play in transcription, related to the promoter and terminator sequences on dna?
it knows how to synthesize dna from mismatched codons.
it knows where to begin transcribing and where to stop.
it knows which codons are needed to replace thymine with uracil.
it knows when a strand of mrna should leave the cells nucleus.

Explanation:

• Promoter: In transcription, the promoter is a specific DNA sequence. DNA polymerase recognizes this sequence as the starting point for transcription.
• Terminator: The terminator is another DNA sequence. DNA polymerase recognizes it as the signal to stop transcription.
• Other options:
• Option A: DNA polymerase synthesizes DNA from nucleotides, not from mismatched codons.
• Option C: Replacing thymine with uracil is a characteristic of RNA (not directly related to DNA polymerase's role with promoter and terminator).
• Option D: mRNA leaving the nucleus is related to post - transcription processing (like mRNA export mechanisms), not directly to DNA polymerase's role with promoter and terminator.

Answer:

B. It knows where to begin transcribing and where to stop.