DNA is composed of two strands, only one of which typically is used as a template for RNA synthesis. By what mechanism is the correct strand chosen?
A) Both strands are tried, and the one that works is remembered.
B) Only one strand has the start codon.
C) The promoter acts to aim the RNA polymerase.
D) A start factor informs the system.
E) It is chosen randomly.

Question

Quizplus · Accepted Answer

The promoter region on the DNA molecule acts as a signal to direct the RNA polymerase to the correct strand to use as the template for RNA synthesis. Thus, the correct strand is chosen based on the location of the promoter.

DNA Is Composed of Two Strands, Only One of Which