Multiple Choice
In most biological systems, what type of macromolecule is an enzyme?
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6. Enzymes and Enzyme Kinetics
Enzymes
Multiple Choice
In enzyme-catalyzed reactions, can a single enzyme molecule be reused to catalyze reactions with multiple substrate molecules over time?
A
No; each enzyme molecule catalyzes only one reaction and is consumed as a reactant.
B
Yes; the enzyme is regenerated after each catalytic cycle and can bind and convert additional substrate molecules unless it is inhibited or denatured.
C
Yes, but only if the enzyme forms a covalent bond with the substrate during catalysis.
D
No; after catalysis the enzyme remains permanently bound to the product and cannot bind new substrate.
Verified step by step guidance1
Understand the role of enzymes in biochemical reactions: enzymes act as biological catalysts that speed up reactions without being consumed in the process.
Recall the concept of the catalytic cycle, where an enzyme binds to a substrate to form an enzyme-substrate complex, converts the substrate into product, and then releases the product.
Recognize that after releasing the product, the enzyme returns to its original state, making it available to bind to new substrate molecules.
Note that enzymes are not permanently altered or consumed during the reaction, which allows them to catalyze multiple rounds of substrate conversion.
Consider exceptions such as enzyme inhibition or denaturation, which can prevent the enzyme from functioning properly, but under normal conditions, enzymes are reusable.
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