1 In trimeric G proteins GTP binds to the alpha subunit the

1. In trimeric G proteins, GTP binds to:

the alpha subunit.

the beta subunit.

the gamma subunit.

the activated trimer.

2. Phosphatidylinositol 4,5-bisphosphate (PIP₂) is cleaved by phospholipase C into:

1,2-diacylglycerol (DAG).

phosphatidylinositol (PI).

inositol 1,4,5-trisphosphate (IP₃).

1,2-diacylglycerol (DAG) and inositol 1,4,5-trisphosphate (IP₃)

3. 1,2-diacylglycerol (DAG) and inositol 1,4,5-trisphosphate (IP3) are cleaved from phosphatidylinositol 4,5-bisphosphate (PIP₂) by the enzyme:

adenylyl cyclase.

phosphodiesterase.

phospholipase C.

protein kinase C.

	a.	the alpha subunit.
	b.	the beta subunit.
	c.	the gamma subunit.
	d.	the activated trimer.

Solution

In General protein coupled receptor the GTP binds to alpha subunit of the trimeric G protein. By the action of phospho lipase C , the given compound cleaved to diacylglecerol and inositol triphosphate. The enzyme is phospholipase C.