behavior

SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. For the following questions, match the membrane model or description with the scientist(s) who proposed the model. Each choice may be used once, more than once, or not at all. A. H. Davson and J. Danielli B. I. Langmuir C. C. Overton D. S. Singer and G. Nicolson E. E. Gorter and F. Grendel 1) Membranes are made of lipids because substances that dissolve in lipids enter cells more rapidly than lipid-insoluble substances. 2) Made artificial membranes by adding phospholipids dissolved in benzene to water. 3) The first to propose that cell membranes are phospholipid bilayers.

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Metabolism is best described as A) breakdown of macromolecules. B) control of enzyme activity. C) synthesis of macromolecules. D) A and B. E) A, B, and C. 2) Which term most precisely describes the general process of breaking down large molecules into smaller ones? A) anabolism B) catabolism C) catalysis D) dehydration E) metabolism 3) Which of the following is true regarding catabolic pathways? A) They do not depend on enzymes. B) They lead to the synthesis of catabolic compounds. C) They release energy as they degrade polymers to monomers. D) They consume energy to build up polymers from monomers. E) Both A and B are correct.