What is a transcription factor?
a. A protein that binds to DNA polymerase to affect the rate of gene replication.
b. A sequence of DNA that is bound by regulatory molecules that control expression of a nearby gene.
c. A protein that binds to a specific DNA sequence and affects the expression of that gene.
d. A specific sequence of DNA that binds to another specific (complementary) sequence of DNA to regulate transcription of a gene.