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Transcription and Regulation

Q1:

The transcriptional regulatory proteins in eukaryotes which induce transcription usually have

A at least two distinct domains of protein structure, a DNA binding domain and an activation domain

B at least two distinct domains of protein structure and a DNA binding domain

C at least one distinct domains of protein structure, a DNA binding domain and an activation domain

D none of these

ANS:A - at least two distinct domains of protein structure, a DNA binding domain and an activation domain

Can anyone tell me why it is A and not C? I got a bit confused after looking at all textbooks.

Thanks!



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