
Unit 3 Cellular Energetics 词汇题
Quiz by Zhao
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47 questions
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- Q1Which term refers to a biological catalyst composed of proteins that speed up chemical reactions?Structural proteinCoenzymeEnzymeSubstrate30s
- Q2What is the name of the region on an enzyme where substrate molecules bind?Allosteric siteInhibitor siteActive siteDenaturation point30s
- Q3Which term denotes the specific reactant that an enzyme acts upon?CatalystProductInhibitorSubstrate30s
- Q4Which of the following best defines a biological catalyst?Protein that increases reaction rates without being consumedMolecule that is permanently consumed in reactionsIon that stabilizes reaction intermediatesSubstance that raises activation energy30s
- Q5What term describes the minimum energy required to initiate a chemical reaction?Enthalpy changeActivation energyReaction quotientFree energy30s
- Q6Which process involves the disruption of an enzyme's three-dimensional structure, resulting in loss of function?CatalysisDenaturationPhosphorylationActivation30s
- Q7At which point does an enzyme exhibit its maximum activity in terms of acidity or alkalinity?Optimal pHProton gradientDenatured pHEquilibrium constant30s
- Q8The temperature at which an enzyme functions most efficiently is called the _____.Optimal temperatureDenaturing temperatureThreshold temperatureActivation threshold30s
- Q9Which term refers to the process where an enzyme's structure is temporarily altered but can regain activity when conditions return to normal?Reversible denaturationCompetitive inhibitionIrreversible denaturationAllosteric modulation30s
- Q10A molecule that binds to the active site of an enzyme, preventing substrate binding, is known as a _____.Allosteric modulatorNoncompetitive inhibitorCompetitive inhibitorCofactor30s
- Q11Which type of enzyme inhibitor binds to an allosteric site and decreases enzyme activity without competing with the substrate?Substrate analogCompetitive inhibitorCoenzymeNoncompetitive inhibitor30s
- Q12What is the name of the site on an enzyme where regulatory molecules can bind and alter enzyme activity?Catalytic siteAllosteric siteActive siteBinding groove30s
- Q13Which series of protein complexes transfers electrons and pumps protons across a membrane during respiration?Krebs cycleCalvin cycleElectron transport chainGlycolytic pathway30s
- Q14What term describes the combined effect of the concentration gradient and electrical potential across a membrane?Chemical gradientMembrane potentialProton motive forceElectrochemical gradient30s
- Q15The difference in proton concentration across a membrane is known as a _____.Proton gradientGibbs free energyElectrical potentialChemical buffer30s