4. (4 pts.) Give one unique feature for each of the receptor types and give one feature common to all three receptor types. UNIQUE FEATURE: Intracellular receptors

G-protein linked receptors (don't put "linked to G-proteins"!)

Tyrosine kinase receptors (don't put "tyrosine kinase")

COMMON FEATURE OF ALL:

5. (4 pts.) Write increase, decrease, or stays the same to indicate how the levels of cAMP are affected by each of the following:

a. G-protein bound to a form of GTP which cannot be hydrolyzed to GDP____________________________

b. mutation of the receptor so it cannot bind the ligand ____________________________________________

c. large decrease in the levels of ATP __________________________________________________________

d. mutation in adenlyate cyclase that inactivates it ________________________________________________

9. (3 pts.) Below are listed three different kinases. Give the name of one molecule that activates them.

1. Protein Kinase C - Activator ____________________________________

2. Protein Kinase A - Activator ____________________________________

3. Tyrosine kinase receptor - Activator _____________________________________