The main difference between facilitated diffusion and active transport of molecules across a membrane is whether an energy transfer is performed whether the molecule is polar or nonpolar whether the direction of transport is with or against a concentration gradient whether or not a protein channel is needed A. B. C. D. 18. In a chemical reaction that is catalyzed by an enzyme, which of the following is most likely to increase the rate of product formation in a cell? A. removing product as it is made B. adding an enzyme inhibitor C. decreasing the temperature to 25°C D. increasing the pH to pH-10 19. Which form of membrane transport is most appropriate for cholesterol-derived hormones? A. endocytosis B. simple diffusion C. facilitated diffusion D. active transport

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