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 false?

Enzymes are consumed during the reactions they catalyze.

Most enzymes are proteins.

Enzyme activity can be affected by changes in pH and temperature.

Enzymes increase the rate of chemical reactions by lowering the activation energy.

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Verified step by step guidance

Step 1: Begin by understanding the role of enzymes in biochemical reactions. Enzymes are biological catalysts that speed up chemical reactions without being consumed in the process. This is a key property of enzymes.

Step 2: Review the statement 'Enzymes are consumed during the reactions they catalyze.' This statement is false because enzymes remain unchanged after the reaction and can be reused for subsequent reactions.

Step 3: Examine the statement 'Most enzymes are proteins.' This is true, as the majority of enzymes are composed of proteins, although some RNA molecules (ribozymes) can also act as enzymes.

Step 4: Analyze the statement 'Enzyme activity can be affected by changes in pH and temperature.' This is true because enzymes have optimal pH and temperature ranges, and deviations from these conditions can denature the enzyme or reduce its activity.

Step 5: Evaluate the statement 'Enzymes increase the rate of chemical reactions by lowering the activation energy.' This is true, as enzymes function by reducing the energy barrier required for a reaction to proceed, thereby increasing the reaction rate.