Some metabolic pathways are regulated in part by changes in the rate of degradation of key enzymes. This is an example of
A) operon control.
B) transcriptional control.
C) liquid hybridization.
D) feedback inhibition.
E) posttranslational control.

Question

Quizplus · Accepted Answer

Posttranslational control refers to regulatory mechanisms that modify the activity or stability of proteins after they have been synthesized. Changes in the rate of degradation of key enzymes fall under this category. This type of regulation allows for rapid response to metabolic demands without having to wait for changes in gene expression or transcriptional control. Operon control and transcriptional control both involve regulation at the level of gene expression. Liquid hybridization is not a mechanism of gene regulation. Feedback inhibition involves the end product of a metabolic pathway inhibiting an earlier enzyme in the pathway, which is not the same as regulating enzyme degradation.

Some Metabolic Pathways Are Regulated in Part by Changes in the Rate