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17) Once a protein binds to DNA at a specific site a) Transcription may be blocked b) RNA polymerase may bind more efficientl
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Once a protein binds to DNA at a specific site e) all of these choices may result.

Proteins are of different types. Some proteins act as enhancer or activator, while others act as inhibitors. To start transcription process, RNA polymerase requires some other transcription factors; such as TFIID, TFIIA, TBP, TFIIB. These proteins bind to specific sequence of DNA to recruit RNA polymerase and then transcription process starts.

There are some inhibitor proteins called repressor or silencers which bind to the upstream region of promoter complex of DNA to inactivate transcription process. Rate of transcription can also be increased by the binding of upstream activator sequence or enhancers. These all factors are proteins.

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