Question

When comparing the effects of regulatory transcription factors that affect TFIID and those that affect adaptor or mediator proteins

a) TFIID binding prevents transcription while mediator binding allows transcription.
b) mediator proteins allow for the binding of RNA polymerase but transcription can be prevented by transcription factors that bind to silencer regions.
c) transcription factors which bind to silencers prevent binding of both proteins.
d) transcription factors which bind to enhancers stimulate binding of both proteins.

Answer 1

Regulatory transcription factors can have different effects on TFIID and mediator proteins. TFIID binding prevents transcription, while mediator binding allows transcription. Transcription factors that bind to silencer regions can prevent transcription, while transcription factors that bind to enhancers can stimulate the binding of both TFIID and mediator proteins.

Step-by-step explanation:

Regulatory transcription factors can have different effects on TFIID and adaptor (mediator) proteins. TFIID binding prevents transcription, while mediator binding allows transcription. Transcription factors that bind to silencer regions can prevent transcription even when mediator proteins are present. Transcription factors that bind to enhancers can stimulate the binding of both TFIID and mediator proteins, thereby enhancing gene expression.