Which of the following statement is NOT correct about how enzymes catalyse a reaction?

Question

BlackTom AI · Accepted Answer

When evaluating how enzymes catalyse a reaction, a number of statements describe the catalytic roles enzymes can play, while one statement does not align with the typical mechanism.
Option 1: 'It provides a reaction surface' — Enzymes create an active site that brings substrates close together, effectively providing a specialized surface where the reaction can occur more readily. This surface is complementary in shape and chemistry to the transition state, which lowers the activation barrier.
Option 2: 'It positions reactants in correct positions for a reaction' — Correct: one of the core roles of an enzyme is to orient substrates precisely so the reactive groups interact efficiently. Proper alignment reduces the entropy of the reactants and makes the reaction more likely to proceed.
Option 3: 'It strengthens bonds in reactants' — This is the misleading statement. Enzymes do not typically strengthen existing bonds in substrates to force a reaction; rather, they lower the activation energy by stabilizing the transition state and providing an environment that facilitates bond breaking/forming. Strengthening bonds would usually slow the reaction rather than catalyze it.
Option 4: 'It may be involved in the enzyme mechanism' — True: many enzymes participate through catalytic residues (acids, bases, metals, or cofactors) that are directly involved in the reaction mechanism, such as donating/accepting protons or stabilizing transition states.
Option 5: 'It provides a suitable typically hydrophobic environment' — Context matters, but enzymes often create specific microenvironments in the active site, which can be hydrophobic or hydrophilic as needed to stabilize transition states or exclude water. Therefore this statement can describe a real enzymatic strategy in many cases.
In summary, the statement that stands out as not describing a catalytic role of enzymes is the third option, since strengthening bonds in reactants is not how enzymes typically catalyse reactions; they rather facilitate bond making/breaking by orienting substrates, providing a conducive active-site environment, and participating in the mechanism.

Which of the following statement is NOT correct about how enzymes catalyse a reaction?单项选择题

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