Question

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.

Answer 1

Upstream activator sequences (UASs) in yeast, enhancers, and silencers are all regulatory sequences involved in gene regulation. UASs are specific sequences located upstream of a gene and function to enhance transcription. Enhancers can be located upstream, downstream, within the coding region, or on different chromosomes.

Step-by-step explanation:

Upstream activator sequences (UASs) in yeast, enhancers, and silencers are all regulatory sequences involved in gene regulation. UASs are specific sequences that are located upstream of a gene and function to enhance transcription. Enhancers, on the other hand, can be located upstream, downstream, within the coding region of a gene, or even on different chromosomes. They bind to transcription factors and enhance transcription by altering the three-dimensional structure of DNA, allowing for interactions between activators and the transcription initiation complex. Silencers, as the name suggests, function to inhibit or silence gene expression.