Table of contents

1. Introduction to Biochemistry4h 34m
2. Water3h 23m
3. Amino Acids8h 10m
4. Protein Structure10h 4m
5. Protein Techniques14h 5m
6. Enzymes and Enzyme Kinetics13h 38m
7. Enzyme Inhibition and Regulation 8h 42m
8. Protein Function 9h 41m
9. Carbohydrates7h 49m
10. Lipids5h 49m
11. Biological Membranes and Transport 6h 37m
12. Biosignaling9h 45m
Review 1: Nucleic Acids, Lipids, & Membranes2h 47m
Review 2: Biosignaling, Glycolysis, Gluconeogenesis, & PP-Pathway3h 12m
Review 3: Pyruvate & Fatty Acid Oxidation, Citric Acid Cycle, & Glycogen Metabolism2h 26m
Review 4: Amino Acid Oxidation, Oxidative Phosphorylation, & Photophosphorylation1h 48m

6. Enzymes and Enzyme Kinetics

Enzymes

Biochemistry

6. Enzymes and Enzyme Kinetics

Enzymes

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Multiple Choice

Which of the following statements best explains why each of the reactions in a metabolic pathway is catalyzed by a specific enzyme?

Enzymes are only required for the first and last steps of a pathway.

Enzymes can catalyze any reaction regardless of substrate structure.

All enzymes in a pathway have identical structures and functions.

Each enzyme has a unique active site that binds only to its specific substrate.

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Verified step by step guidance

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.