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Exergonic reactions
a. are spontaneous.
b. have a negative ΔG value.
c. release energy.
d. All of these are correct.
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- Which statements are true and which are false? Modify each false statement so that it reads correctly. a. In a closed system, neither energy nor matter is exchanged with the surroundings. b. State functions are independent of the pathway. c. A process is isothermic if ΔH = 0. d. The sign and magnitude of ΔG give important information about the direction and rate of a reaction. e. At equilibrium, ΔG = ΔG°. f. For two reactions to be coupled, they must have a common intermediate.Endergonic reactions do which of the following? Select all that apply. A. Are nonspontaneous B. Consume energy C. Are spontaneous D. Release energyIn an anabolic reaction A. biological molecules are broken down and the Gibbs free energy increases. B. biological molecules are synthesised and the Gibbs free energy is invariant. C. biological molecules are broken down and the Gibbs free energy decreases. D. biological molecules are synthesised and the Gibbs free energy increases. E. biological molecules are synthesised and the Gibbs free energy decreases.
- All chemical reactions are theoretically reversible. However, many biological reactions are irreversible. Which factor(s) contribute to the irreversibility of biological reactions? a. high energy requirementsb. product removalc. state of chemical equilibriumd. a and be. a, b, and cReactions that release free energy area. exergonic.b. spontaneous.c. endergonic.d. endothermic.e. both a and b.Anabolic reactions: A. Require Energy B. Create Energy C. Break large compounds into simpler compounds D. Both A &C
- This is an _____ reaction since energy must be added to create product The potential energy of the reactants is ______ The potential energy of the products is ______ The change in potential energy, ΔE, is _____ A. exothermic B. endothermic C. unthermic D. 15 kcal/mol E. 40 kcal/mol F. 25 kcal/mol G. 50 kcal/mol H. 10 kcal/molWhich 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 energyWhich of the followingdescribe superior properties of enzymes (biological catalysts) over traditional chemical catalysts? a. They are mostly and generally operative under mild temperature, pressure, and pH conditions b. They are regulated only by substrate concentration c. They do not effect the reaction equilibrium, but lower the reaction's activation energy d. They are recycled at the end of the reaction Choose all that apply
- Which 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.The reactions that have no net free energy change is . a. reversible O b. equilibrium O c. allosteric O d. endergonic e. kineticWhich 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.