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