A) \[\sigma \]-subunit
B) \[\beta \]-subunit
C) \[\text{ }\!\!\rho\!\!\text{ -}\]factor
D) spliceosome
Correct Answer: A
Solution :
RNA polymerase consists of a core enzyme, with subunits \[(\alpha ,\alpha ,\beta ,\beta ,\omega )\]and a sigma \[(\sigma )\]factor. The sigma factor initiates transcription of mRNA on the DNA template and directs the binding of the enzyme to the promoter region. The core enzyme continues transcription.
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