1.Proteins modified by calcium binding and/or phosphorylation do not control
a) membrane transport and receptor proteins. b) metabolic enzymes. c) denatured proteins. d) B and C e) all of the above
2.Receptors of a target cell __________.
a) exhibit specificity in binding ligands b) determine the target cell's response c) bind to all possible ligandswith equal affinity d) A and B e) A and C
3.Insulin secretion
a) can be triggered by the nervous system and a digestive tract hormone. b) from pancreatic beta cells in response to elevated blood glucose is a simple reflex. c) causes increased glucose concentration in the blood. d) A and B e) A and C
4.Varicosities
a) store and release neurotransmitters. b) are enlarged regions found along the axon. c) are found the autonomic division. d) A and B e) all of the above
5.Receptor molecules for chemical signaling are located
a) in the mitochondria b) in the nucleus c) in the cell membrane d) all of the above