15. What happens in a cell when adenylyl cyclase is activated? (A) cAMP is created (B) cAMP is destroyed (C) G proteins bind to cAMP (D) steroid hormones pass through the lipid bilayer

18. Penguins, seals, and tuna have body forms that permit rapid swimming, because _______. (A) all share a recent common ancestor (B) all of their bodies have been compressed since birth by intensive underwater pressures (C) the shape is a convergent evolutionary solution, which reduces drag while swimming (D) this is the only shape that will allow them to maintain a constant body temperature in water

15. What happens in a cell when adenylyl cyclase is activated?
(A) cAMP is created
(B) cAMP is destroyed
(C) G proteins bind to cAMP
(D) steroid hormones pass through the lipid bilayer

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