and DNA are not major chemical components of cell membranes. PTS: 1 DIF: Cognitive Level: Remembering 2. Which statements are true concerning the process of mediated transport? (Select all that apply.) a. Can be active or passive b. Only moves one molecule at a time c. Involves transport proteins d. Expends tremendous energy e. Occurs only with hormones ANS: A

C Mediated transport uses membrane transport proteins and can be either active or passive. Mediated transport systems can move molecules singly or two at a time and may or may not use energy. Many substances can be moved through mediated transport. PTS: 1 DIF: Cognitive Level: Remembering 3. What is passive transport dependent on? (Select all that apply.) a. Semipermeable barrier membrane b. The process of osmosis c. Diffusion as a driving force d. A living host e. Hydrostatic pressure ANS: A

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