13. Steroid and polypeptide hormones typically have in common _______. (A) the building blocks from which they are synthesized (B) their solubility in cell membranes (C) their requirement for travel through the bloodstream (D) their reliance on signal transduction in the cell

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

13. Steroid and polypeptide hormones typically have in common _______.
(A) the building blocks from which they are synthesized
(B) their solubility in cell membranes
(C) their requirement for travel through the bloodstream
(D) their reliance on signal transduction in the cell

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