Which of the following will be activated by phosphorylation of key enzymes by protein kinase A (cAMP dependent protein kinase? (select all that apply)

a. Gluconeogenesis in liver

b. Glucose uptake via GLUT 4 transporters

c. Glycogenolysis in liver

d. Glycogenesis in skeletal muscle

e. Cholesterol biosynthesis in liver

f. Phosphofructokinase-2 in liver

g. Lipolysis in adipose tissue

Answer: A) Gluconeogenesis in liver, B) Glucose uptake via GLUT 4 transporters, C) Glycogenolysis in liver and F) Phosphofructokinase-2 in liver.

Explanation: All above the given answers are activated by the phosphorylation of key enzymes by the protein kinase. As, it is caused by the conformational changes in the cAMP, it is stand for cyclic AMP. Phosphorylation is the process which are used in the mechanism of the activities of the enzymes, also known as molecular switching of the activation and deactivation.