Chapter4 Energy and Cell Metabolism

Chapter4 Energy and Cell Metabolism - Exam Name_ MULTIPLE...

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Exam Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) What happens to the oxygen that we breathe? A) It is exhaled. B) It is incorporated into organic molecules during cellular metabolism. C) It is combined with hydrogen to form water. D) It acts as a coenzyme in the production of ATP. E) A and C 1) 2) Which of these results in a REDUCED molecule? A) loss of H + B) loss of electrons C) gain of H + D) gain of electrons E) A and D 2) 3) The addition of a phosphate group to a substrate is called __________. The enzyme that catalyzes this reaction is referred to as a __________. A) phosphorylation; kinase B) phosphorylation; phosphatase C) proteolysis; peptidase D) proteolysis; kinase E) None of the above represents the correct terminology. 3) 4) An exergonic chemical reaction A) converts molecules into molecules that have less free energy. B) releases energy as the reaction progresses. C) requires the input of energy. D) A and B E) A, B, and C 4) 5) Enzymes A) may be synthesized as inactive molecules. B) may require the binding of cofactors such as calcium. C) do not require coenzymes for metabolic reactions. D) A and B E) all of the above 5) 6) In the metabolic reactions of cells, molecules such as vitamin C and biotin act as A) modulators. B) cofactors. C) coenzymes D) vitamins. E) B and C 6) 1
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a chemical reaction is in equilibrium A) the reaction has stopped. B) there are equivalent amounts of reactants and products. C) the reaction is proceeding at its maximum rate. D) there is no net change in the amount of reactants or products. E) A and D 7) 8) How would the lack of a required cofactor for an enzyme affect that enzyme's function? A) The enzyme would function more slowly. B) The enzyme's function would not be altered. C) The enzyme would function more quickly. D) The enzyme would not be able to function. E) none of the above 8) 9) One kilocalorie (kcal) is the amount of energy needed to raise one __________ of water by 1 degree Celsius. A) cup B) gallon C) liter D) tablespoon E) milliliter 9) 10) An enzyme that adds or subtracts water molecules is A) ligase. B) lipase. C) hydrolase. D) kinase. E) lyase. 10) 11) An allosteric modulator binds to A) the active site. B) the product. C) the substrate. D) a region of the enzyme other than the active site. E) the surrounding tissue. 11) 12) Enzymes are often useful as diagnostic tools. How? A) Damaged cells release enzymes into the blood so that plasma levels of the enzyme are noticeably elevated. B) The liver releases enzymes that accumulate in the urine. C) Enzymes destroy damaged cells so X - rays reveal smaller body organs. D) Enzymes
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Chapter4 Energy and Cell Metabolism - Exam Name_ MULTIPLE...

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