Which Statement About Transcription Factors is True

Question

Which statement about transcription factors is true?
A) All transcription factors are repressors.
B) All transcription factors are activators.
C) A promoter is a transcription factor.
D) A transcription factor can be an activator or a repressor.
E) A transcription factor can be both an activator and a repressor.

Accepted Answer

Transcription factors can be either activators or repressors. They bind to specific DNA sequences, called enhancers or repressors, to regulate the expression of genes. A promoter is not a transcription factor, it is the DNA sequence where RNA polymerase binds to initiate transcription.