What is the role of protein kinases?   Question 1 options:   None of these   increase cellular levels of cAMP   bind ligands   phosphorylate other amino acids

QUESTION 4 Which of the following G protein subunits activate K+ channels in response to the GPCR for acetylcholine on heart muscle?   a. Galpha inhibitory.   b. G alpha stimulatory   c. G beta gamma dimer.   d. G alpha transducin.

QUESTION 42 Which of the following statements is INCORRECT? O a. In a protein kinase cascade, the signal is amplified at each step of the cascade. O b. The major difference between a cell that responds to a signal and one that does not is the presence of a receptor O c. Adenylyl cyclase is an enzyme that catalyzes the conversion of ATP to CAMP. Od. In a protein kinase cascade, variation in the response is not possible. O e. Signals can reach target cells in multicellular organisms by diffusion or by circulation in the blood.

QUESTION 23 Which type of enzyme phosphorylates a protein? G protein protein kinase adenylyl cyclase guanosine triphosphatase

QUESTION 46 Use the Information below to answer the question. Compound A B C Binds to receptor Yes Yes No Elicits a response Yes No No Compound X is the natural ligand that binds to a receptor and stimulates a signal transduction pathway associated with the receptor. Based on the information given in the table, what are the roles of compounds A, B, and C? O a. A is an antagonist, B is an agonist, and C is a ligand. O b. A is an agonist, B is an antagonist, and C has no role. O c. A is a ligand, B has no role, and C is an antagonist. O d. A is an agonist, B is an antagonist, and C is an agonist. Oe. A has no role, B is an agonist, and C is an antagonist.

Question 3

Question 85 Choose all that apply Repolarization is a time when O the cell is beginning to conduct current the earth's poles invert Na ions are exiting the cell the cell is returning to resting potential O K ions exit the cell