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 refers to a molecule that acts as a catalyst to speed up a reaction in a living organism?

Enzyme

Inhibitor

Cofactor

Substrate

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Verified step by step guidance

Understand the definition of a catalyst: A catalyst is a substance that increases the rate of a chemical reaction without being consumed in the process.

Recognize that in living organisms, molecules that act as catalysts are typically proteins or RNA molecules known as enzymes.

Review the role of enzymes: Enzymes lower the activation energy required for a reaction, thereby speeding up the reaction in biological systems.

Differentiate between the given terms: An inhibitor slows down or stops a reaction, a cofactor is a non-protein molecule that assists enzymes, and a substrate is the molecule upon which an enzyme acts.

Conclude that the term referring to a molecule that acts as a catalyst to speed up a reaction in a living organism is 'enzyme'.