Biology: Life on Earth (11th Edition)
11th Edition
ISBN: 9780134256283
Author: Audesirk
Publisher: PEARSON
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Chapter 6, Problem 4MC
Summary Introduction
Introduction:
Coupling of reactions is a common process in the cell. This is done to conserve the energy from the reactions that release it. If the reactions are not coupled, the energy is lost in the form of heat but if coupled, they drive the nonspontaneous biochemical reactions.
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Coupled reactionsa. are endergonic overall.b. both synthesize and break down ATP.c. are catalyzed by the same enzyme.d. end with reactants that contain more energy than theirproducts.
Endergonic reactions do which of the following? Select all that apply.
A. Are nonspontaneous
B. Consume energy
C. Are spontaneous
D. Release energy
Choose the best description of an enzyme: (a) It allows a chemical reaction to proceed extremely fast. (b) It increases the rate at which a chemical reaction approaches equilibrium relative to its uncatalyzed rate. (c) It makes a reaction thermodynamically favorable.
Chapter 6 Solutions
Biology: Life on Earth (11th Edition)
Ch. 6 - Which of the following is True? a. Enzymes...Ch. 6 -
2. Which is not an example of an exergonic...Ch. 6 - Which of the following is True? ATP is a long-term...Ch. 6 - Prob. 4MCCh. 6 - Which of the following is False? a. Allosteric...Ch. 6 -
1. According to the first law of thermodynamics,...Ch. 6 - Prob. 2FTBCh. 6 - Prob. 3FTBCh. 6 - The abbreviation ATP stands for ___. The molecule...Ch. 6 -
5. Enzymes are what type of biological molecule?...
Ch. 6 - Prob. 6FTBCh. 6 - Prob. 1RQCh. 6 -
2. Define potential energy and kinetic energy and...Ch. 6 -
3. Define metabolism, and explain how reactions...Ch. 6 - Prob. 4RQCh. 6 - Compare breaking down glucose in a cell to setting...Ch. 6 - Compare the mechanisms of competitive and...Ch. 6 - Describe the structure and function of enzymes....Ch. 6 - 1. While vacuuming, you show off by telling a...Ch. 6 - 2. Refute the following: “According to...Ch. 6 - Prob. 3AC
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- 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 statement is FALSE? a. For S P, a catalyst shifts the reaction equilibrium to the right. b. After a reaction, the enzyme involved becomes available to catalyze the reaction again. c. A reaction may not occur at a detectable rate even though it has a favorable equilibrium. d. Substrate binds to an enzyme's active site. e. Lowering the temperature of a reaction will lower the reaction rate.arrow_forwardYou have a reaction that takes 8 hours to reach completion at 20 degrees celcius. What is the likely result of changing the temperature to 30 degrees celcius? a. the reaction should take less times b. reaction time would be unaffected c. the reaction should take more time Which would be the correct answer to this question?arrow_forward
- Cells carry out anabolic as well as catabolic pathways, with some enzymes functioning in both types of pathways. (a) Explain why these enzymes catalyze near-equilibrium reactions. (b) Explain why opposing anabolic and catabolic pathways must have different enzymes for at least one of the steps.arrow_forwardThe oxidation of NADH is favorable because it involves: a) Separation of like charges. b) Conversion of non-polar to polar bonds. c) Increased resonance. d) Conversion of liquid to gas.arrow_forwardSome cool enzyme (CE) catalyzes the conversion of compound F to compound A. Which of the following must be true of CE? a) CE can facilitate conversion of compound A into compound F. b) CE binds more tightly to the substrate F than to the product A. c) CE decreases the energy of the transition state between compounds F and A. d) CE facilitates net conversion of F to A whenever F is present.arrow_forward
- Which 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_forwardenzymes 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 productarrow_forwardWhich of the following statements is/are true about enzyme-catalyzed reactions? A. The reaction is faster than the same reaction. B. The free energy change of the reaction is opposite from the reaction in the absence of the enzymes. C. The reaction always goes in the direction toward chemical equilibrium. D. A and B only E. A, B and Carrow_forward
- What terms would best describe the above coupled reaction?A. it is non-spontaneous and endothermic (because the overall Go is positive)B. it is spontaneous and exothermic (because the overall Go is positive)C. it is non-spontaneous and exothermic (because the overall Go is positive)D. it is spontaneous and exothermic (because the overall Go is negative)E. it is non-spontaneous and endothermic (because the overall Go is negative)arrow_forwardKinase reactions describe enzymes which _____________. a. transfer groups from one part of a molecule to another b. use NAD/ NADH in their reactions. c. add or remove double bonds in molecules. d. add phosphate groups to another moleculearrow_forwardA. Will decreasing the amount of energy needed to make an exergonic reaction occur cause the reaction to be more exergonic? Why or why not? B. Will such an energetic alteration change the rate of the reaction? Why or why notarrow_forward
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