BIOLOGY
12th Edition
ISBN: 9781260169614
Author: Raven
Publisher: RENT MCG
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Textbook Question
Chapter 6, Problem 6U
Which of the following is NOT a properly of a catalyst?
a. A catalyst reduces the activation energy of a reaction.
b. A catalyst lowers the free energy of the reactants.
c. A catalyst does not change as a result of the reaction.
d. A catalyst works in both the forward and reverse directions of a reaction.
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Which statement is true regarding the function of a catalyst in a chemical reaction? a) A catalyst increases the rate of a reaction. b) A catalyst provides an alternate mechanism for the reaction. c) A catalyst is not consumed by the reaction. d) All of the above are true.
enzymes are efficient catalysts because they can do which of the following? A) catalyze reactions that ottherwise would not occur. B) decrease the free energy of activation of reactions, C) decrease the standard free energy change o reactions , D) prevent the conversion of product to substrate, E) shift the equilibrium of reactions toward more complete inversion of product
Which two of the following apply to the products of an exergonic reaction?
A. Have less energy than the reactants
B. Are less ordered than the reactants
C. Are more ordered than the reactants
D. Have more energy than the reactants
Chapter 6 Solutions
BIOLOGY
Ch. 6.1 - Prob. 1LOCh. 6.1 - Prob. 2LOCh. 6.1 - Describe the nature of redox reactions.Ch. 6.2 - Explain the laws of thermodynamics.Ch. 6.2 - Prob. 2LOCh. 6.2 - Contrast the course of a reaction with and without...Ch. 6.3 - Describe the role of ATP in short-term energy...Ch. 6.3 - Prob. 2LOCh. 6.4 - Discuss the specificity of enzymes.Ch. 6.4 - Explain how enzymes bind to their substrates.
Ch. 6.4 - Prob. 3LOCh. 6.5 - Prob. 1LOCh. 6.5 - Prob. 2LOCh. 6.5 - Prob. 3LOCh. 6 - Prob. 1DACh. 6 - A covalent bond between two atoms represents what...Ch. 6 - During a redox reaction the molecule that gains an...Ch. 6 - Prob. 3UCh. 6 - A spontaneous reaction is one in which a. the...Ch. 6 - Prob. 5UCh. 6 - Which of the following is NOT a properly of a...Ch. 6 - Where is the energy stored in a molecule of ATP?...Ch. 6 - Prob. 1ACh. 6 - Which of the following statements is NOT true...Ch. 6 - Prob. 3ACh. 6 - Prob. 4ACh. 6 - Enzymes have similar responses to both changes in...Ch. 6 - Prob. 6ACh. 6 - Examine the graph showing the rate of reaction...Ch. 6 - Phosphofructokinase functions to add a phosphate...
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- One major difference between inorganic catalysts and organic catalysts is: A. Inorganic catalysts may not be compatible with biological parameters B. Organic catalysts are consumed during the chemical reaction C. Organic catalysts influence the activation energy of a reaction D. Inorganic catalysts decrease the probability a reaction will occurarrow_forwardWhich of the following is true for all exergonic reactions? Group of answer choices A. The reactions are nonspontaneous B. A net input of energy from the surroundings is required for the reactions to proceed C. Some reactants will be converted to products D. The products have more total energy than the reactants E. The reaction proceeds with a net release of free energyarrow_forwardWhich of the following statements is false? a. A reaction may not occur at a detectable rate even though it has a favorable equilibrium. b. After a reaction, the enzyme involved becomes available to catalyze the reaction again. c. For S → P, a catalyst shifts the reaction equilibrium to the right. d. Lowering the temperature of a reaction will lower the reaction rate. e. Substrate binds to an enzyme's active site.arrow_forward
- Which of the following is NOT true of enzymes? a) They may interact chemically with their substrates b) They may catalyze a reaction in both forward and reverse directions. c) They may alter Keq for the reaction that they catalyze. d) They may decrease the entropy of their substrates.arrow_forwardWhich of the following accurately describes how an enzyme functions? a. reduces the energy content of the products b. allows for the exothermic reaction of materials that are usually endothermic c. changes the reaction mechanism effectively reducing the activation energy d. shifts the equilibrium for the reactionarrow_forwardA reducing chemical reaction ________. a. removes a hydrogen atom from the substrate b. adds an electron to the substrate c. reduces the compound to a simpler formarrow_forward
- An enzyme accelerates chemical reactions by all of the following, EXCEPT: a) Bringing reactants close together b) Shifting equilibrium to favor the products c) Adding temporary charges to substrates d) Orienting chemical bonds for best reactivity e) Straining chemical bonds that will be brokenarrow_forwardWhich of the following is TRUE about the enzymatic catalysis of a chemical reaction? A. It increases the energy of the transition state B. It decreases the free energy ∆G so that a reaction can proceed spontaneously C. It decreases the energy of the transition state D. It increases the forward and reverse ratesarrow_forwardWhich of the following is NOT true about enzymes A. they do not alter reaction equilibria B. they accelerate the forward rate of a reaction C. they decrease ∆G’0 of a reaction D. they accelerate the reverse rate of a reaction E. they stabilize transition statesarrow_forward
- Substance A is converted to substance B in a metabolic reaction. Which statement best describes the role of enzyme during this reaction? A. It dissolves substance A in the reaction medium. B. It speeds up the reaction without it being consumed in the process. C. It provides energy to the reaction system D. It adjusts the pH of the reaction medium.arrow_forwardWhich of the following is not true about enzymes: a. They increase ΔG of reactions. b. They are usually made of amino acids. c. They lower the activation energy of chemical reactions. d. Each one is specific to the particular substrate(s) to which it binds.arrow_forwardWhich of the following statements regarding enzymes is true? A. Enzymes decrease the free energy change of a reaction. B. Enzymes cjange the direction of chemical reaction. C. Enzymes prevent changes in substrate concentrations. D. Enzymes increase the rate of a reaction. E. Enzymes are permanently altered by the reactions they catalyze.arrow_forward
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