Transporters, Channels, and Pumps 1. Fatty acids enter the cells lining the small intestine by: A. Simple diffusion B. Facilitated diffusion C. Active transport 2. The PepT is a H+/peptide antiporter located in the small intestine. It has which of the following characteristics? A. requires ATP for activity B. exhibits maximal transport when saturated C. requires H+ and peptides for activity D. B and C E. A, B, and C Answer 1: A. Simple diffusion Answer 2: D. B and C