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Unit 3 Cellular Energetics 词汇题

Quiz by Zhao

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47 questions
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  • Q1
    Which term refers to a biological catalyst composed of proteins that speed up chemical reactions?
    Structural protein
    Coenzyme
    Enzyme
    Substrate
    30s
  • Q2
    What is the name of the region on an enzyme where substrate molecules bind?
    Allosteric site
    Inhibitor site
    Active site
    Denaturation point
    30s
  • Q3
    Which term denotes the specific reactant that an enzyme acts upon?
    Catalyst
    Product
    Inhibitor
    Substrate
    30s
  • Q4
    Which of the following best defines a biological catalyst?
    Protein that increases reaction rates without being consumed
    Molecule that is permanently consumed in reactions
    Ion that stabilizes reaction intermediates
    Substance that raises activation energy
    30s
  • Q5
    What term describes the minimum energy required to initiate a chemical reaction?
    Enthalpy change
    Activation energy
    Reaction quotient
    Free energy
    30s
  • Q6
    Which process involves the disruption of an enzyme's three-dimensional structure, resulting in loss of function?
    Catalysis
    Denaturation
    Phosphorylation
    Activation
    30s
  • Q7
    At which point does an enzyme exhibit its maximum activity in terms of acidity or alkalinity?
    Optimal pH
    Proton gradient
    Denatured pH
    Equilibrium constant
    30s
  • Q8
    The temperature at which an enzyme functions most efficiently is called the _____.
    Optimal temperature
    Denaturing temperature
    Threshold temperature
    Activation threshold
    30s
  • Q9
    Which term refers to the process where an enzyme's structure is temporarily altered but can regain activity when conditions return to normal?
    Reversible denaturation
    Competitive inhibition
    Irreversible denaturation
    Allosteric modulation
    30s
  • Q10
    A molecule that binds to the active site of an enzyme, preventing substrate binding, is known as a _____.
    Allosteric modulator
    Noncompetitive inhibitor
    Competitive inhibitor
    Cofactor
    30s
  • Q11
    Which type of enzyme inhibitor binds to an allosteric site and decreases enzyme activity without competing with the substrate?
    Substrate analog
    Competitive inhibitor
    Coenzyme
    Noncompetitive inhibitor
    30s
  • Q12
    What is the name of the site on an enzyme where regulatory molecules can bind and alter enzyme activity?
    Catalytic site
    Allosteric site
    Active site
    Binding groove
    30s
  • Q13
    Which series of protein complexes transfers electrons and pumps protons across a membrane during respiration?
    Krebs cycle
    Calvin cycle
    Electron transport chain
    Glycolytic pathway
    30s
  • Q14
    What term describes the combined effect of the concentration gradient and electrical potential across a membrane?
    Chemical gradient
    Membrane potential
    Proton motive force
    Electrochemical gradient
    30s
  • Q15
    The difference in proton concentration across a membrane is known as a _____.
    Proton gradient
    Gibbs free energy
    Electrical potential
    Chemical buffer
    30s

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