The extent to which a given gene is transcribed presumably depends upon __________.
A)the single transcription factor bound to its upstream regulatory elements
B)the particular combination of transcription factors bound to its upstream regulatory elements
C)the particular combination of transcription factors bound to its downstream regulatory elements
D)the combination of initiation factors bound to its upstream regulatory elements
E)the combination of translational factors bound to its upstream regulatory elements

Question

Quizplus · Accepted Answer

The transcription of a gene is regulated by the binding of transcription factors to the upstream regulatory elements of the gene. The particular combination of transcription factors determines the extent to which the gene is transcribed. Therefore, choice B, which states that the extent of transcription depends on the particular combination of transcription factors bound to the upstream regulatory elements, is the correct answer. In contrast, choices A, C, D, and E are not accurate explanations for the regulation of transcription.

The Extent to Which a Given Gene Is Transcribed Presumably