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

During each step of a metabolic pathway, a separate ______ is needed to catalyze the reaction.

enzyme

coenzyme

inhibitor

substrate

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Verified step by step guidance

Step 1: Understand the context of the problem. The question is asking about the role of a specific molecule in catalyzing reactions within a metabolic pathway. Metabolic pathways are sequences of chemical reactions occurring within a cell, and each step is facilitated by a specific molecule.

Step 2: Recall the definition of an enzyme. Enzymes are biological catalysts that speed up chemical reactions by lowering the activation energy required for the reaction to occur. They are highly specific to the reactions they catalyze.

Step 3: Consider the role of coenzymes. Coenzymes are organic molecules that assist enzymes in catalyzing reactions, often by transferring chemical groups or electrons. However, they are not the primary catalysts; they work in conjunction with enzymes.

Step 4: Evaluate the role of inhibitors. Inhibitors are molecules that decrease the activity of enzymes, either by binding to the active site or altering the enzyme's structure. They do not catalyze reactions but rather prevent or slow them.

Step 5: Analyze the role of substrates. Substrates are the reactants in enzyme-catalyzed reactions. They bind to the enzyme's active site but are not responsible for catalysis themselves. Therefore, the correct answer is 'enzyme,' as it is the molecule required to catalyze each step of a metabolic pathway.