A G-protein receptor with GTP bound to it _____
A) is in its active state
B) signals a protein to maintain its shape and conformation
C) will use cGMP as a second messenger
D) directly affects gene expression
Answer: A
You might also like to view...
What substance in milk is broken down by Lactobacillus acidophilus?
a. Lactose b. Cellulose c. Glycogen d. Glucose e. Starch
What system reclaims fluids and proteins that have escaped from blood capillaries?
a. cardiovascular b. pulmonary c. lymphatic d. sinoatrial e. venous
Enzyme activity may be regulated by several means. What is the mode of regulation in each of the following examples?
A) allosteric regulation or feedback inhibition B) substrate-level regulation C) inhibition D) proteolytic cleavage 1) When glucose is converted to glucose-6-phosphate by hexokinase, the accumulation of glucose-6-phosphate inhibits the reaction. 2) A foreign substance is added to the reaction in part a above. This substance binds to hexokinase and prevents its ability to catalyze the reaction. E) covalent modification 3) An inactive form of an enzyme becomes active after being phosphorylated. 4) Pepsinogen becomes pepsin after being released into the lumen of the stomach. 5) In a series of enzymatic reactions, it is found that the product of the last reaction inhibits the first enzyme in the series of reactions.
Which of the following is a primary consumer?
a. cow b. dog c. hawk d. fox e. snake