Which statement correctly describes how transcription factors regulate gene expression?
Answer and explanation
Correct answer: B. They bind to DNA sequences near a gene and change the rate of its transcription
- Step 1: Transcription factors are proteins that recognise promoter or enhancer DNA sequences.
- Step 2: By helping or blocking RNA polymerase, they raise or lower mRNA production.
Answer
bind DNA near a gene and change its transcription rate.
Why not the others: tRNA matching is done by the ribosome; splicing is done by the spliceosome; unwinding in replication is done by helicase.
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