As regards attenuation/control of the PI cycle second messengers, which of the following statements, if any, is/are true?
A) Diacylglycerol (DAG) can be directly converted to Phosphatidic Acid.
B) Diacylglycerol (DAG) can also be converted to a fatty acid and a monoacylglycerol.
C) Upon ligand binding, GTP is exchanged for GDP on a monomeric G protein then hydrolysis of GTP to GDP will inactivate the G protein.
D) All of the above.
E) None of the above.

Question

Quizplus · Accepted Answer

A) Diacylglycerol (DAG) can be directly converted to Phosphatidic Acid.
B) Diacylglycerol (DAG) can also be converted to a fatty acid and a monoacylglycerol.
Both of these statements are true as DAG can be converted to phosphatidic acid by adding a phosphate group, or it can be broken down to a fatty acid and monoacylglycerol by a DAG lipase.

C) Upon ligand binding, GTP is exchanged for GDP on a monomeric G protein then hydrolysis of GTP to GDP will inactivate the G protein.
This statement is also true as the hydrolysis of GTP to GDP on a G protein will cause its inactivation.

As Regards Attenuation/control of the PI Cycle Second Messengers, Which