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 term describes a molecule that decreases the activity of an enzyme by binding to its active site?

Competitive inhibitor

Allosteric activator

Substrate

Cofactor

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Verified step by step guidance

Step 1: Understand the role of the active site in enzyme function. The active site is the region of an enzyme where substrate molecules bind and undergo a chemical reaction. It is highly specific to the substrate's shape and chemical properties.

Step 2: Define the term 'competitive inhibitor.' A competitive inhibitor is a molecule that resembles the substrate and competes for binding to the enzyme's active site, thereby decreasing the enzyme's activity by preventing the substrate from binding.

Step 3: Compare the other options provided in the question. An allosteric activator binds to a site other than the active site and increases enzyme activity, which is not relevant here. A substrate is the molecule that the enzyme acts upon, and a cofactor is a non-protein molecule that assists enzyme function but does not inhibit activity.

Step 4: Recognize that the molecule described in the question decreases enzyme activity by binding to the active site, which matches the definition of a competitive inhibitor.

Step 5: Conclude that the correct term for the molecule described in the question is 'competitive inhibitor,' based on its mechanism of action and the provided options.