Multiple Choice
Which of the following is true about water-soluble hormones?
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Cyclic AMP functions as a second messenger to:
(a) Build proteins and catalyze specific reactions
(b) Activate adenylate cyclase
(c) Open ion channels and activate key enzymes in the cytoplasm
(d) Bind the hormone–receptor complex to DNA segments
A researcher observes that stimulation by a particular hormone induces a marked increase in the activity of G proteins in the target plasma membrane. The hormone being studied is probably:
(a) A steroid
(b) A peptide
(c) Testosterone
(d) Estrogen
(e) Aldosterone