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Question 1Which of the following statements is false with respect to an enzyme's ability to catalyse a reaction? a) An enzyme provides a reaction surface and a suitable environment for the reaction to take place. b) An enzyme binds reactants such that they are positioned correctly and can attain their transition-state configurations. c) An enzyme allows the reaction to go through a less stable transition state than would normally be the case. d) An enzyme can weaken bonds in reactants through the binding process. Question 2Which of the following statements is not true regarding the active site of an enzyme? a) An active site is normally a hollow or cleft on the surface of an enzyme. b) An active site is normally hydrophilic in nature. c) Substrates fit into active sites and bind to functional groups within the active site. d) An active site contains amino acids which are important to the binding process and the catalytic mechanism. Question 3Which of the following statements best describes an allosteric binding site? a) It is a binding site containing amino acids with aliphatic side chains. b) It is a binding site that can accept a wide variety of differently shaped molecules. c) It is a binding site, which is separate from the active site, and affects the activity of an enzyme when it is occupied by a ligand. d) It is a description of an active site which has undergone an induced fit. Question 4Which of the following descriptions best describes an induced fit? a) The process by which an active site alters shape such that it is ready to accept a substrate. b) The process by which a substrate adopts the correct binding conformation before entering an active site. c) The process by which a substrate binds to an active site and alters the shape of the active site. d) The process by which an active site alters the shape of the substrate such that it can adopt the necessary active conformation for binding. Question 5Which of the following statements is incorrect with respect to an enzyme's ability to catalyse a reaction? a) an enzyme provides a reaction surface and a hydrophilic environment for the reaction to take place b) an enzyme binds reactants such that they are positioned correctly and can attain their transition-state configurations c) an enzyme allows the reaction to go through a more stable transition state than would normally be the case d) an enzyme can weaken bonds in reactants through the binding process Question 6Some enzymes require the presence of a non-protein substance if they are to catalyse a reaction. Which of the following terms is the best general term for such a substance? a) prosthetic group b) cofactor c) co-enzyme d) modulator Question 7What term is used for a non-protein organic molecule that is required by some enzymes in order to catalyse a reaction on a substrate? a) prosthetic group b) cofactor c) co-enzyme d) modulator Question 8Some enzymes covalently bind a non-protein organic molecule to the active site. The organic molecule concerned is required if the enzyme is to catalyse a reaction on a substrate. What is the term used for such a molecule? a) prosthetic group b) cofactor c) co-enzyme d) modulator Question 9Which of the following molecules is involved in the feedback control of the enzyme phosphorylase a? a) glucose-1-phosphate b) adrenaline c) glycogen d) AMP Question 10What secondary messenger is generated as a result of the action of nitrous oxide? a) GTP b) cyclic GMP c) ATP d) cyclic AMP Question 11From which amino acid is nitrous oxide generated? a) arginine b) aspartic acid c) asparagine d) lysine Question 12The Michaelis-Menton equation relates the rate of an enzyme-catalysed reaction to which of the following? a) Substrate concentration b) Product concentration c) Activation energy d) Inhibitor concentration How does an enzyme increase the speed of a reaction?Enzymes are biological catalysts. Catalysts lower the activation energy for reactions. The lower the activation energy for a reaction, the faster the rate. Thus enzymes speed up reactions by lowering activation energy.
How do enzymes function to speed up the rate of reactions quizlet?How do enzymes speed up chemical reactions? Enzymes speed up reactions by lowering activation energy, the lower the activation energy for a reaction, the faster the rate.
Which of the following statements best justifies the inclusion of test tube 3 and 7 in the experiment?Which of the following statements best justifies the inclusion of test tubes 3 and 7 in the experiment? They will show whether the isolated cellular contents have enzymatic activity.
Which of the following statements is true about enzymes?Answer and Explanation: The correct answer is (b) Enzymes can require vitamin or mineral cofactors for their function. Enzymes are proteins that function to catalyze chemical reactions in living organisms.
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Which of the following statements best helps explain how the enzyme speeds of the reaction?
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