Multiple Choice
Which of the following enzymes is responsible for catalyzing the hydrolysis of peptide bonds in proteins?
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6. Enzymes and Enzyme Kinetics
Enzymes
Multiple Choice
Which of the following statements best explains why each of the reactions in a metabolic pathway is catalyzed by a specific enzyme?
A
Enzymes are only required for the first and last steps of a pathway.
B
Enzymes can catalyze any reaction regardless of substrate structure.
C
All enzymes in a pathway have identical structures and functions.
D
Each enzyme has a unique active site that binds only to its specific substrate.
Verified step by step guidance1
Step 1: Understand the role of enzymes in metabolic pathways. Enzymes are biological catalysts that speed up chemical reactions by lowering the activation energy required for the reaction to occur.
Step 2: Recognize that enzymes are highly specific. Each enzyme has a unique three-dimensional structure, including an active site that is complementary to the structure of its specific substrate. This specificity ensures that only the correct substrate can bind to the enzyme.
Step 3: Analyze why each reaction in a metabolic pathway requires a specific enzyme. Metabolic pathways consist of a series of reactions, each involving a unique substrate and product. For each reaction, a specific enzyme is needed to catalyze the conversion of the substrate into the product.
Step 4: Eliminate incorrect statements. For example, enzymes are not only required for the first and last steps of a pathway; they are needed for every step. Enzymes cannot catalyze any reaction regardless of substrate structure, and enzymes in a pathway do not have identical structures and functions.
Step 5: Conclude that the correct explanation is: 'Each enzyme has a unique active site that binds only to its specific substrate.' This ensures the precise regulation and efficiency of metabolic pathways.
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