In a fruit fly, the transcription rates of a gene that codes for an enzyme vary tremendously among different cell types.The most likely reason for these differences is that different cell types have different
A) promoters.
B) inducers.
C) transcription factors present.
D) silencers.
E) enhancers.

Question

Quizplus · Accepted Answer

Transcription factors are proteins that bind to specific DNA sequences, thereby controlling the flow (or transcription) of genetic information from DNA to mRNA. Different cell types express different sets of transcription factors, which in turn regulate the transcription rates of specific genes, including those coding for enzymes, in a cell-type-specific manner. This is a key mechanism by which cells with the same DNA can differentiate and perform specialized functions.

In a Fruit Fly, the Transcription Rates of a Gene