Biology CLEP Prep Practice Exam

What is the role of a promoter region in a gene?

1. ontrolling gene expression

2. Designating gene location

3. Activating gene transcription

4. Regulating gene function

The correct answer is: Activating gene transcription

A promoter region is responsible for activating gene transcription, which means it helps initiate the process of creating an RNA copy of the gene. This RNA copy, known as mRNA, is then used to direct the production of a specific protein. Option A is incorrect because while a promoter region does play a role in controlling gene expression, it specifically activates gene transcription, not overall gene expression. Option B is incorrect because while a promoter region does help designate the location of a gene, that is not its primary role. Option D is incorrect because a promoter region does not directly regulate gene function, it is involved in the initial step of gene expression.