20 Questions
Which of the following statements about enzymes is true?
Enzymes lower the activation energy required for reactions to proceed.
What is the function of cofactors in enzyme activity?
To stabilize the transition state of the reaction.
Which type of enzyme regulation occurs when a molecule binds to the enzyme at a location other than the active site?
Allosteric regulation
What limits the rate of catalysis in enzymes?
The concentration of substrate and available enzyme.
Which factor does NOT affect the rate of enzyme-catalyzed reactions?
Enzyme's intrinsic affinity for the substrate
How can pharmaceuticals exploit enzymes?
By inhibiting the enzyme's active site.
Which enzyme is targeted by Lipitor, a drug used to lower cholesterol levels?
HMB-CoA reductase
What type of enzymes are involved in breaking down cellulose?
Cellulases
What is the purpose of modifying microbes' enzymes?
To enhance the enzyme's catalytic activity.
Which of the following is NOT a condition that affects enzyme function?
Cofactor concentration
Which of the following best describes catalysis?
The process of lowering the activation energy of a reaction
What is the role of enzymes in chemical reactions?
To decrease the activation energy of the reaction
What determines the rate of a chemical reaction?
The temperature and the concentration of reactants
What is the function of enzymes in bringing reactants together?
To orient the reactants in a precise manner
What is the role of enzymes in stabilizing transition states?
To stabilize the intermediate condition
Which of the following is NOT a characteristic of enzymes?
They break down proteins and lipids
What is the relationship between activation energy and the energy barrier of a reaction?
Activation energy is the energy needed to overcome the energy barrier
What condition needs to be reached for a reaction to occur?
The transition state
What is the function of a catalyst in a reaction?
To decrease the activation energy of the reaction
In the context of enzymes, what does the -ase ending indicate?
The molecule is an enzyme
Test your knowledge on catalysis and how enzymes speed up reactions. Learn about the importance of precise reactant orientation and the kinetic energy required for bond formation.
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