The universal regulatory mechanism in eukaryotes for controlling gene expression includes a. control of the processing of mrna after it is transcribed from dna but before it leaves the nucleus, and control of the rate it leaves the nucleus. b. control of the genes transcribed and the rate they are transcribed. c. control of mrna in the cytoplasm after it leaves the nucleus, including changes to mrna before translation begins. d. control of polypeptides after they have been synthesized but before they are functional. e. all of these mechanisms are used; there is no single universal mechanism.

E. All of these mechanisms are used; there is no single universal mechanism.

Explanation:

Gene expression is regulated at many levels. Some of them are:

what statement best describes the difference between the sympathetic and parasympathetic nervous systems?

the sympathetic nervous system prepares the body for intense physical activity and is often referred to as the fight-or-flight response. the parasympathetic nervous system has almost the exact opposite effect and relaxes the body and inhibits or slows many high energy functions.

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.