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Questions  

The σ factor

a
helps RNA polymerase to attach to specific site of DNA called promoter.
b
alter the specificity of the RNA polymerase to terminate the process of transcription.
c
adds nucleoside triphosphates and polymerises in a template depended fashion following the rule of complementarity.
d
provides energy to the process of transcription.

detailed solution

Correct option is A

The σ factor helps RNA polymerase to attach to specific site of DNA called promoter.

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