Open QuestionSome hormones act bya. increasing the synthesis of enzymes,b. converting an inactive enzyme into an active enzyme,c. affecting only specific target organs,d. all of these.
Open QuestionCyclic 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.
Open QuestionA 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.
Multiple ChoiceHormones can bring about substantial physiological changes at very low concentrations. How does this relate to the concept of second messenger systems?
Multiple ChoiceYou are studying how a hormone affects a cell and find that when oxytocin binds the receptor, the intracellular CaCaCa2^22+^++ concentration increases. Based on this information, what could you logically conclude about this cell and hormone?