Question
Which is wrong in case of enzyme catalysis?(a) Enzymes work best at an optimum temperature.(b) Enzymes work best at an optimum $\mathrm{pH}$.(c) Enzymes are highly specific for substrates(d) An enzyme raises activation energy.
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Enzymes are proteins that act as biological catalysts. They speed up chemical reactions in a cell. They are highly specific, meaning they only catalyze specific reactions with specific substrates. Show more…
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Which of the following statements concerning enzyme-catalyzed reactions is NOT correct? (a) Enzymes increase the reaction rate by lowering the activation energy (b) Enzymes increase the reaction rate by stabilizing the transient state of reactants (c) Enzymes increases the reaction rate by increasing the equilibrium constant (d) Enzyme activity may be affected by changes in pH (e) None of the above 4. A competitive inhibitor of an enzyme has all of the following properties EXCEPT; (a) Has a structure similar to the substrate (b) May have a higher affinity to the enzyme than the substrate (c) Binds to the active site of the enzyme (d) Increases the Km value (e) None of the above
Identify the single most correct choice: Select one: a. Enzymes can operate at low temperatures. b. pH may change the rate of an enzyme's activity. c. Enzymes can lower the activation energy of reactions and they (enzymes) are produced by the living cells. d. All of the above.
Which of the following statements about enzymes is incorrect? a) Enzymes can initiate chemical reactions. b) Enzymes speed up chemical reactions. c) Enzymes often induce conformational changes in the substrates that they bind. d) Enzymes contain an active site for binding of particular substrates. e) Enzymes undergo a permanent change during the reactions they promote.
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