Question

1- All of the following molecules can serve as hormones EXCEPT:

a. Water

b. Peptides

c. Steroids

d. Gases

e. Vitamins

2- Which of the following statements about G proteins is FALSE?

a. G proteins are heterotrimers

b. G proteins bind GTP and GDP

c. G proteins are transmembrane proteins

d. G proteins can activate downstream enzymes

e. There are different versions of alpha subunits

3- After cyclic AMP is generated, what is usually the next step in signal transduction?

a. cAMP activates adenylyl cyclase

b. cAMP binds G proteins and activates the alpha subunit

c. cAMP binds CREB and activates transcription

d. cAMP binds protein kinase A and releases the catalytic subunits

e. cAMP removes phosphate groups off target enzymes

Answer 1