b The energy released through breaking chemical bonds d· The energy required to
ID: 192008 • Letter: B
Question
b The energy released through breaking chemical bonds d· The energy required to initiate a deixal rracan s, which of the following is Nor·property of catalyst? 5. Eaaymes have similar respoeses to both changes in tempecou in free energy between reactants and products and Pat effect of both i' the race of movemest of the subtrale b strength of the chemical bonds within the substrae c. thee-dimensional shape of the enzyme. A catalyst reduces the activation b A calalyst lowers the free energy of the reactants. c. A catalyst does not change as a result of the ceaction d. A catalyst works in both the forward and reverse directions of activation energy of a eaction 6. Feodback inthibition is an efficient way to cotool a matabolic pahway because the 7. Where is the eoergy stoeed in a molecule of ATP a first entyme in a pathway is inhibited by its own product b. laatenayme a way isnaband by Rs own proud. Wihin the bonds between nitrogen and carbon b. Is the carbon-to-carbon boeds found in the ribose c. In the phosphorus-to-oxygen double bond d. In the bonds connecting the two terminal phosphate groups first enayme in a pathway is inhibited by the end-prodoct of 4 last enryme in a pathrway is inhibined by the ead-peodact of APPLY SYNTHESIZE . Cells use ATP to drive endergonic reactions because 1. Examine the graph showing the tate of reaction versus temperature foe an enzyme-catalyned reaction in a haman a. Describe what is happening to the enyme at around 400 b. Explain why the line toaches the ais at approximately 20°c c. Average body temperature Sot bumans is 37"C. Suggest a. ATP is the universal catalys b. energy released by ATP hydrolysis makes &G; for coupled reactions mmo negative energy released by ATP hydrolysis makes Gfr coupled 45 reactions more positive. d the conversion of ATP to ADP is also endergonkc. Which of the following statements is NOT true about esrymes? a eason why the semperastore optirmam of this enzyme is greater than 37 C 2. Enzymes use the theee-dimensional shape of theie active sine Optimum temperature to bind reactants. b. Enzymes lower the activation energy fora reaction e. Enzymes make .G for a reaction mace negative. d. Eazymes can catalyze the forward and reverse directions 3. ATP hydrolysis has a f-74 kcalmol. Can an endergonic Tamperature of reaction reaction with a Gor 12 kcalmol be"driven" by ATP hydrolysis? 2. Phospholfracookinase fusctions to add a phosphate group to a molecule of fructose 6-phoighate. This enzyme functions early in glycolysis, an energy-yielding biochemical pathway discussed in chapter 7. The enzyme has an active sine that binds frectose and ATP. An allosteric inhibitory site also binds ATP when cellala levels of ATP are very high. a. Prodict the rate of the reaction if the levels of cellular ATP No, the overall G is still positive. Yes, the overall &G; would now be negative. Yes, but only if an enzyme is used to lower G. d. No, overall :G is now negative. decide not to bid on this because a there is not enough energy in the universe to power this 4. An online aoction site offers a perpetual-motice machine. You aze low. Predict the rate of the reaction if levels of cellular ATP are very high. Describe what is happening to the earyme when levels of ATP are very high. machine. b. the First Law says you cannot create energy. c b. the Second Law says that energy loss due to entropy will not c. allow for perpetual motion. d it could work, but would require a strong catalyst. UNDERSTAND 3. An endergonic reaction has the following properties +,G and the reaction is spontaneous. b. + G and the reaction is not spontaneous. c. AG and the reaction is spontaneous d. -AGnd the reaction is not spontaneous 1. A covalent boad between two atoens represents what kind of energy? a. Kinetic energy b· Potential energy c. Mechanical energy d. Solar energy 4. A spontaneous reaction is ose in which a. the reactants have a higher free energy than the prodocts. b. the products have a higher free energy than the reactants. c. an input of energy is required d. entropy is decreased 2. During a redox reaction the molecule that gains an electron has been a. reduced and now has a higher energy level. b. oxidized and now has a lower energy level. c. reduced and now has a lower energy level. d. oxidized and now has a higher energy level. 5. What is activation energy? 1The thermal energy associated with random movements of moleculesExplanation / Answer
The correct option is is c. A catalyst does not change as a result of the reaction.
It is not a property of a catalyst.
A catalyst makes the reaction faster by providing an alternative pathway with a lower activation energy.
The enzyme can only affect the activation energy for a reaction.
A catalyst accelerates both the forward and the reverse reactions. So, the inclusion of a catalyst does not alter the equilibrium constant of a reversible reaction.
5) The correct option is c. three-dimensional shape of the enzyme.
The shape of the active site is very important for determining the specificity of the enzyme.
6) The correct option is c. first enzyme in a pathway is inhibited by the end product of the pathway.
Feedback inhibition is an efficient method to control a metabolic pathway because the first enzyme in a pathway is inhibited by the end product of the pathway.
7) The correct option is d. In the bonds connecting the two terminal phosphate group.
The ATP molecule can store energy in the form of a high energy phosphate bond, which joins the terminal phosphate group to the rest of the molecule.
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