1. Chapter 1 Although the basic structure of the cell plasma membrane is formed by a lipid bilayer, most of the specific membrane functions are carried out by: A) Bound and transmembrane proteins B) Complex, long carbohydrate chains C) Surface antigens and hormone receptors D) A gating system of selective ion channels Ans: A Feedback: The functions of plasma membrane depend on the presence of proteins that are bound in the lipid bilayer and some that have the ability to pass freely into and out of the cell. Carbohydrate chains form a cell coat that surrounds the membrane and that contain surface antigens and surface hormone receptors. Some ion channels are gated and open only when the membrane potential changes significantly. 2. Which describes the function of the nucleus? A) It is basically the site of protein synthesis in the body. B) It contains the genetic code for the individual. C) It is the transformer of cellular energy. D) It initiates the process of aerobic metabolism. Ans: B Feedback: The nucleus contains DNA, wh


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