RNA pol III is controlled by three factors (complexes). Two are called "Assembly Factors", and the other is a true "Initiation Factor". The Initiation Factor directly specifies the startpoint for transcription. Which complexes are designated as "Assembly Factors"?

A. TFIIIA and TFIIIB
B. TFIIIA and TFIIIC
C. TFIIIB and TFIIIC
D. UBF1 and SL1

Option B

Explanation:

IIITFIIIA and TFIIIC are assembly factors, while TFIIIB is the transcription initiation factor proper of RNA polymerase .TFIIIC acts as an assembly factor that positions TFIIIB to bind to DNA at a site centered approximately 26 base pairs.

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explanation: