Genes are really just segments of DNA in patterns of As, Ts, Gs, and Cs. How does an RNA polymerase "know" where to start transcribing at the beginning of a particular gene?
A) RNA polymerase does not know, so it has to rely on the ribosome to help it start at the correct place.
B) It looks for a specific promoter region that marks the beginning of a gene.
C) The polymerase starts transcribing anywhere because the beginning point counts only during translation.
D) The polymerase finds the end of the previous gene and copies past that point.
Answer: B
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