The function of upstream promoter elements in eukaryotes, such as enhancers and silencers, is to:

a. serve as binding sites for RNA polymerase.
b. regulate the efficiency of transcription initiation.
c. regulate RNA polymerase binding to the TATA box.
d. encode enhancer and silencer proteins.
e. add methyl groups to genes.


b

Biology & Microbiology

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