Question

question 5 of 10
what is the role of the noncoding dna segment called a promoter?

a. it regulates how coding sequences are copied during transcription.

b. it copies other sections of dna to make genes.

c. it contains codes for nucleic acids rather than proteins.

d. it protects the ends of the chromosome.

Explanation:

To determine the role of a promoter (a noncoding DNA segment), we analyze each option:

• Option A: Promoters are regions where RNA polymerase binds to start transcription, regulating how coding sequences are transcribed (copied into RNA). This matches the function of a promoter.
• Option B: Promoters do not copy DNA to make genes; that is not their role.
• Option C: Promoters are noncoding and do not code for nucleic acids in this context; their role is regulatory, not coding.
• Option D: Telomeres protect chromosome ends, not promoters.

Answer:

A. It regulates how coding sequences are copied during transcription.