Concept explainers
Videos
Reactions that release free energy are
- a. exergonic.
- b. spontaneous.
- c. endergonic.
- d. endothermic.
- e. both a and b.
Introduction: Gibbs free energy can be defined as the energy associated with chemical reactions that are required to do work. The free energy of a system is a way of combining enthalpy and entropy (randomness) into one value.
Answer to Problem 1TY
Correct answer: The chemical reactions that result in a release of free energy (exergonic) develop spontaneously and these reactions do not require energy input to proceed. These reactions always occur with a release of energy. Hence, the correct answer is option e.
Explanation of Solution
Reason for correct answer:
The definition of reaction spontaneity suggests that the difference in Gibbs standard state free energy change is always negative. It means that difference between free energy of products and the free energy of reactants is always negative. These spontaneous reactions always take place with a release of energy which indicates that they are exergonic.
Option e. is given as “both a and b”.
Spontaneous reactions release free energy (exergonic) and these reactions do not need input of energy. Hence, the correct answer is option e.
Reasons for incorrect answer:
Option a. is given as, “exergonic”.
Reactions which release free energy are exergonic and these reactions also occur spontaneously. Hence, option a. is incorrect.
Option b. is given as, “spontaneous”.
Reactions which release free energy are spontaneous as definition of reaction spontaneity suggests that difference in Gibbs standard state free energy change is always negative. These reactions are also exergonic in nature. Hence, option b. is incorrect.
Option c. is given as, “endergonic”.
Endergonic reactions always require input of energy from an outside source to occur. These reactions always consume energy and are unable to release free energy. Hence, option c. is incorrect.
Option d. is given as, “endothermic”.
Endothermic reactions results in an overall decrease of temperature. Lowering of temperature indicates that energy would be consumed during the reaction and will not be released. Hence, option d. is incorrect.
Hence, the options a., b., c., and d. are incorrect.
Reactions that release free energy take place in a spontaneous manner and are exergonic in nature. These reactions do not need any kind of energy input.
Want to see more full solutions like this?
Chapter 6 Solutions
BIOLOGY: TULANE CUSTOM
Additional Science Textbook Solutions
HUMAN ANATOMY
Becker's World of the Cell (9th Edition)
Microbiology Fundamentals: A Clinical Approach - Standalone book
Biology: Life on Earth
Microbiology Fundamentals: A Clinical Approach
Genetics: Analysis and Principles
- the energy released by ___ reactions is used to run ________ reactions A. ENDERGONIC; ENDERGONIC B. EXERGONIC; ENDERGONIC C. EXERGONIC; EXERGONIC D. ENDERGONIC; EXERGONICarrow_forwardThe reactions that have no net free energy change is . a. reversible O b. equilibrium O c. allosteric O d. endergonic e. kineticarrow_forwardWhich of the following is true of metabolism? A. Degradative reactions require an input of energy. B. Synthetic pathways are anabolic. C. Catabolism and anabolism are linked by O2. D. Catabolic reactions require the breakdown of ATP, and anabolic reactions generate ATP.arrow_forward
- Which statements concerning free energy change are true?a. Free energy change is a measure of the rate of a reaction.b. Free energy change is a measure of the maximum amountof work available from a reaction.c. Free energy change is a constant for a reaction under anyconditions.d. Free energy change is related to the equilibrium constantfor a specific reaction.e. Free energy change is equal to zero at equilibrium.arrow_forwardEnzymes are: A. Broken down in reactions that require energy input. B. Not needed forr catabolic reactions. C. Electron carrier molecules. D. Proteins that function as catalysts. E. All of the choices are correct.arrow_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
- Which of these statements concerning enzymes is correct? a. Enzymes increase the rate of reactions but are permanently changed as a result. b. Enzymes are proteins that function as catalysts. c. Enzymes increase the activation energy requirement for a reaction to occur. d. Enzymes usually can only double the rate of a chemical reaction. e. Enzymes increase the kinetic energy of the reactants.arrow_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_forwardWhat statements concerning free energy change are true or false? a. Free energy change is a measure of the rate of a reaction. b. Free energy change is a measure of the maximum amount of work available from a reaction. c. Free energy change is a constant for a reaction under any conditions. d. Free energy is related to the equilibrium constant for a specific reaction. e. Free energy change is equal to zero at equilibriumarrow_forward
- Exergonic reaction absorbs free energy from its surroundings. a. False O b. Truearrow_forwardEnergy is defined as the ability to cause change. Which is the best reason why? Because energy influences everything. а. b. Because some form of energy is required to produce a change. С. Because energy is everywhere. d. Because energy can change forms.arrow_forwardWhen ATP is hydrolyzed to produce ADP and phosphate the chemical reaction is Select one: a. Endergonic b. Neither releases nor requires input of energy c. Exergonicarrow_forward
Biology (MindTap Course List)BiologyISBN:9781337392938Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. BergPublisher:Cengage Learning