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Name:    chap6practice

Multiple Choice Identify the letter of the choice that best completes the statement or answers the question.
A B C D E	1.	The second law of thermodynamics holds that a. matter can be neither created nor destroyed. b. energy can be neither created nor destroyed. c. energy of one form is converted to a less concentrated form whenever energy is transformed or transferred. d. entropy decreases with time. e. none of these
A B C D	2.	The second law of thermodynamics states that a. energy can be transformed into matter and, because of this, we can get something for nothing. b. energy can be destroyed only during nuclear reactions, such as those that occur inside the sun. c. if energy is gained by one region of the universe, another place in the universe also must gain energy in order to maintain the balance of nature. d. energy tends to become increasingly more disorganized.
A B C D E	3.	Essentially, the first law of thermodynamics says that a. one form of energy cannot be converted into another. b. entropy is increasing in the universe. c. energy can be neither created nor destroyed. d. energy cannot be converted into matter or matter into energy. e. all of these
A B C D E	4.	Which of the following is NOT true? a. Cells lose some energy in the form of heat. b. Energy flows in one direction. c. The web of life refers to the flow of energy through an ecosystem. d. The primary source for energy on earth is the sun. e. The most common and important form of energy available for living organisms is heat.
A B C D E	5.	The most common form of low-quality energy released in energy conversions is a. metabolic. b. heat. c. entropy. d. exergonic emission. e. oxidation.
A B C D E	6.	Endergonic reactions a. have more energy in the reactants than in the products. b. have more energy in the products than in the reactants. c. are illustrated by the breakdown of glucose. d. are the mechanisms used by animals to provide energy for biological reactions. e. have more energy in the products than in the reactants and are illustrated by the breakdown of glucose.
A B C D E	7.	ATP contains a. alanine. b. arginine. c. ribose. d. tyrosine. e. glucose.
A B C D E	8.	ATP contains a. adenine. b. cytosine. c. uracil. d. thymine. e. guanine.
A B C D E	9.	A "high-energy bond" a. absorbs a large amount of free energy when the phosphate group is attached during hydrolysis. b. is formed when ATP is hydrolyzed to ADP and one phosphate group. c. is usually found in each glucose molecule; that is why glucose is chosen as the starting point for glycolysis. d. releases a large amount of usable energy when the phosphate group is split off during hydrolysis. e. none of these
A B C D E	10.	The removal of electrons from a compound is known as a. dehydration. b. oxidation. c. reduction. d. phosphorylation. e. a nonreversible chemical reaction.
A B C D E	11.	NAD+ and FAD are a. coenzymes. b. electron acceptors. c. reduced forms. d. coenzymes and electron acceptors. e. coenzymes, electron acceptors, and reduced forms.
A B C D E	12.	Enzymes a. are very specific. b. act as catalysts. c. are organic molecules. d. have special shapes that control their activities. e. all of these
A B C D E	13.	Activation energy a. is less when enzymes are present. b. allows greater interaction of substrate with the active site. c. is needed to begin a reaction. d. is less when enzymes are present and is needed to begin a reaction. e. is less when enzymes are present, allows greater interaction of substrate with the active site, and is needed to begin a reaction.
A B C D E	14.	Inhibitors of enzyme-catalyzed reactions act by a. forming clusters of reactants that are unable to break free. b. tying up ATP supplies. c. binding to the enzyme's active site. d. tying up ATP supplies, and binding to the enzyme's active site. e. forming clusters of reactants that are unable to break free, tying up ATP supplies, and binding to the enzyme's active site.
A B C D E	15.	Allosteric inhibition is generally a result of a. excess substrates. b. binding of regulatory molecules at another site. c. a change in the temperature of the system. d. a lack of coenzymes. e. pH inhibition.
A B C D E	16.	An allosteric enzyme a. has an active site where substrate molecules bind and another site that binds with intermediate or end-product molecules. b. is an important energy-carrying nucleotide. c. carries out either oxidation reactions or reduction reactions but not both. d. raises the activation energy of the chemical reaction it catalyzes. e. all of these