Question

question 1 of 10
in eukaryotes, what must bind to a promoter in order for a gene to be turned on?
a. the start codon
b. enhancers
c. transcription factors
d. a repressor gene

Explanation:

• Option A: The start codon is involved in translation (protein synthesis) and not in binding to the promoter for gene activation.
• Option B: Enhancers are DNA sequences that can increase the rate of transcription but they do not directly bind to the promoter in the way that initiates gene - on state.
• Option C: Transcription factors are proteins that bind to specific DNA sequences (including promoters) and regulate the transcription of genes. They are essential for turning a gene on in eukaryotes.
• Option D: A repressor gene typically encodes a protein that inhibits gene expression (turns genes off), not on.

Answer:

C. Transcription factors