A endergonic reactions have a positive g and

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a.Endergonic reactions have a positive ∆Gand exergonic reactions have a negative ∆Gb.Endergonic reactions consume energy andexergonic reactions release energyc.Both endergonic and exergonic reactionsrequire a small amount of energy toovercome an activation barrierd.Endergonic reactions take place slowly andexergonic reactions take place quickly8.Which of the following is the best way to judge therelative activation energies between two givenchemical reactions?Chapter 6 | Metabolism191
a.Compare the ∆G values between the tworeactionsb.Compare their reaction ratesc.Compare their ideal environmentalconditionsd.Compare the spontaneity between the tworeactions9.Which of the following is not an example of anenergy transformation?a.Turning on a light switchb.Solar panels at workc.Formation of static electricityd.None of the above10.Label each of the following systems as high orlow entropy: i. the instant that a perfume bottle issprayed compared with 30 seconds later, ii. an old1950s car compared with a brand new car, and iii. aliving cell compared with a dead cell.a.i. low, ii. high, iii. lowb.i. low, ii. high, iii. highc.i. high, ii. low, iii. highd.i. high, ii. low, iii. Low11.The energy released by the hydrolysis of ATP isa.primarily stored between the alpha and betaphosphatesb.equal to −57 kcal/molc.harnessed as heat energy by the cell toperform workd.providing energy to coupled reactions12.Which of the following molecules is likely to havethe most potential energy?a.sucroseb.ATPc.glucosed.ADP13.Which of the following is not true about enzymes:a.They increase ∆G of reactionsb.They are usually made of amino acidsc.They lower the activation energy ofchemical reactionsd.Each one is specific to the particularsubstrate(s) to which it binds14.An allosteric inhibitor does which of the following?a.Binds to an enzyme away from the activesite and changes the conformation of theactive site, increasing its affinity forsubstrate bindingb.Binds to the active site and blocks it frombinding substratec.Binds to an enzyme away from the activesite and changes the conformation of theactive site, decreasing its affinity for thesubstrated.Binds directly to the active site and mimicsthe substrate15.Which of the following analogies best describethe induced-fit model of enzyme-substrate binding?a.A hug between two peopleb.A key fitting into a lockc.A square peg fitting through the square holeand a round peg fitting through the roundhole of a children’s toyd.The fitting together of two jigsaw puzzlepieces.CRITICAL THINKING QUESTIONS16.Does physical exercise involve anabolic and/orcatabolic processes? Give evidence for your answer.17.Name two different cellular functions that requireenergy that parallel human energy-requiringfunctions.

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