Welcome to the Quiz!
This quiz contains 12 questions from a mix of 1 subtopics.
What is the primary function of enzymes in living organisms?
to synthesise proteins
to store energy
to catalyse chemical reactions
to transport molecules
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Which of the following statements about enzymes is true?
they are consumed during reactions
they increase the activation energy of reactions
they are not affected by temperature
they are specific to particular substrates
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What is the specific region on an enzyme where substrates bind called?
prosthetic group
allosteric site
cofactor
active site
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What happens to the enzyme-substrate complex once the reaction is complete?
the enzyme is degraded
the products remain bound to the enzyme
the enzyme is permanently altered
the products are released
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Which model describes the specificity of enzymes for their substrates?
jigsaw model
allosteric model
lock and key model
Michaelis-Menten model
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Why are enzyme active sites stereospecific?
they are composed of lipids
they are composed of amino acids with chiral centres
they are composed of nucleic acids
they are composed of carbohydrates
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What is the difference between competitive and non-competitive inhibitors?
competitive inhibitors bind to the active site, while non-competitive inhibitors bind elsewhere on the enzyme
competitive inhibitors are always more effective than non-competitive inhibitors
competitive inhibitors are more common, while non-competitive inhibitors are rare
competitive inhibitors are irreversible, while non-competitive inhibitors are reversible
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How can the effect of a competitive inhibitor be reversed?
by increasing the temperature
by decreasing the pH
by adding more enzyme
by increasing the concentration of the substrate
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Which of the following statements about non-competitive inhibitors is true?
their effect can be reversed by increasing substrate concentration
they are less common than competitive inhibitors
they distort the active site, preventing substrate binding
they compete with the substrate for the active site
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Enzymes are composed of acids, which include chiral centres.
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What is the term for the energy needed for a reaction to occur, which is reduced by enzymes?
energy
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What is the term for molecules that decrease the rate of enzyme-catalysed reactions?
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