Consider a Gene Affected by Two Transcription Factors, U and V

question 76

Multiple Choice

Consider a gene affected by two transcription factors, U and V. Transcription of the gene takes place in the presence of U alone or of V alone, but when U and V are present together transcription is repressed. This is an example of:

• A)epigenetic control.
• B)hierarchical control.
• C)chromatin remodeling.
• D)combinatorial control.

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Definitions:

Pharynx

The muscular tube that connects the mouth and nasal passages with the esophagus and larynx, playing a key role in both the respiratory and digestive systems.

Bolus

A small rounded mass of a substance, especially of chewed food at the moment of swallowing.

Esophagus

The part of the digestive tract that conducts food from the pharynx to the stomach.

Amylase

An enzyme that catalyzes the hydrolysis of starch into sugars, present in saliva and pancreatic fluid.