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 about enzymes is correct?

Enzymes lower the activation energy of chemical reactions without being consumed.

Enzymes are consumed in chemical reactions and must therefore be replenished.

Enzymes are only effective at very high temperatures.

Enzymes increase the equilibrium constant of a reaction.

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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 minimum energy required for reactants to transform into products. Enzymes achieve this by stabilizing the transition state, making it easier for the reaction to occur.

Address the statement 'Enzymes lower the activation energy of chemical reactions without being consumed': This is correct because enzymes are not consumed or permanently altered during the reaction. They can be reused multiple times.

Evaluate the statement 'Enzymes are consumed in chemical reactions and must therefore be replenished': This is incorrect because enzymes remain unchanged after the reaction and do not need to be replenished.

Analyze the remaining statements: 'Enzymes are only effective at very high temperatures' is incorrect because enzymes typically function optimally at specific temperatures, often close to physiological conditions. 'Enzymes increase the equilibrium constant of a reaction' is also incorrect because enzymes do not alter the equilibrium constant; they only speed up the rate at which equilibrium is reached.