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    Properties of Enzymes and Catalysis

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    Which of the following statements is true of enzyme catalysts?
    (a) They are generally equally active on D and L isomers of a given substrate
    (b) They can increase the reaction rate for a given reaction by a thousand-fold or more
    (c) They can increase the equilibrium constant for a given reaction by a thousand-fold or
    more.
    (d) Their catalytic activity is independent of pH
    (e) To be effective, they must be present at the same (equimolar) concentration as their substrate
    (f) None of the above

    © BrainMass Inc. brainmass.com December 24, 2021, 11:36 pm ad1c9bdddf
    https://brainmass.com/biology/enzyme-catalysts-and-reactions/properties-enzymes-catalysis-585040

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    Which of the following statements is true of enzyme catalysts?

    The correct answer is (b) They can increase the reaction rate for a given reaction by a thousand-fold or more. Scroll down for explanations of each answer option (correct or incorrect).

    (a) They are generally equally active on D and L isomers of a given substrate
    INCORRECT. Most enzymes are highly stereospecific, meaning that they recognize only specific stereoisomers of their substrate(s). The different stereoisomers have different "shapes", and shape is important for the substrate to be able to 'fit' into the enzyme's binding pocket.

    (b) They can increase the reaction rate for a given reaction by a thousand-fold or more
    CORRECT. Enzymes function by catalyzing reactions that, without the presence of the enzyme, would be much less energetically favorable. By lowering the energy cost for the reaction to proceed, the enzyme enables the reaction to occurs much more quickly (= "catalyzes" = increases the rate of reaction).

    (c) They can increase the equilibrium constant for a given reaction by a thousand-fold or
    more.
    INCORRECT. Enzymes do not impact the equilibrium constant.

    (d) Their catalytic activity is independent of pH
    INCORRECT. Enzymatic activity (aka catalytic activity) is HIGHLY dependent on pH. At the wrong pH, an enzyme may not be active at all!

    (e) To be effective, they must be present at the same (equimolar) concentration as their substrate
    INCORRECT. Enzymes are highly effective when present at VERY LOW concentrations relative to the substrate concentration. A single enzyme molecule can catalyze the conversion of hundreds to thousands of substrate molecules.

    (f) None of the above

    This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here!

    © BrainMass Inc. brainmass.com December 24, 2021, 11:36 pm ad1c9bdddf>
    https://brainmass.com/biology/enzyme-catalysts-and-reactions/properties-enzymes-catalysis-585040

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