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

Enzymes are considered catalysts because they __________.

decrease the equilibrium constant of a reaction

increase the rate of chemical reactions without being consumed in the process

are permanently altered during the reaction

provide energy to drive endergonic reactions

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Verified step by step guidance

Understand the role of enzymes in biochemical reactions: Enzymes are biological catalysts that speed up chemical reactions by lowering the activation energy required for the reaction to proceed.

Clarify the concept of activation energy: Activation energy is the energy barrier that must be overcome for reactants to be converted into products. Enzymes facilitate this process without altering the equilibrium constant of the reaction.

Recognize that enzymes are not consumed: Unlike reactants, enzymes remain unchanged after the reaction and can be reused for subsequent reactions. This is a key characteristic of catalysts.

Distinguish between exergonic and endergonic reactions: Enzymes do not provide energy to drive endergonic reactions; instead, they lower the activation energy, making the reaction more likely to occur under existing conditions.

Conclude that enzymes increase the rate of chemical reactions without being consumed or permanently altered, which is why they are considered catalysts.