Q, 17. Regulatory proteins are the accessory proteins that interact with RNA polymerase and affect its role in transcription. Which of the following statements is correct about regulatory protein?
(a) They only increase expression
(b) They only decrease depression
(c) They interact with RNA polymerase but do not affect the expression
(d) They can act both as activators and as repressors
Ans. (d). Regulatory sequences (proteins) control the functions of structural genes and are at called regulatory genes. The important regulatory genes are promoters, terminators, operators, and repressors.
To regulate the process of transcriptions, transcription factors (a sequence of specific DNA-binding factor) alone or with other proteins, promoter (as on activator) or stop as a repressor the binding site of RNA polymerase to DNA.
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