In what way do upstream activator sequences UASs ,regulatory sequences in yeast,differ from enhancers and silencers?
A)UASs function only upstream.
B)UASs can function only in the 5'-3' direction.
C)Enhancers function only downstream.
D)UASs function only downstream.
E)UASs function in the middle of transcription units.

Question

Quizplus · Accepted Answer

Upstream activator sequences (UASs) function only upstream, while enhancers and silencers can function both upstream and downstream. UASs may also function in either orientation (5'-3' or 3'-5') relative to the transcription start site, whereas enhancers and silencers have specific orientations for optimal function.

In What Way Do Upstream Activator Sequences UASs ,Regulatory Sequences