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 concerning enzymes is false?

Enzymes are consumed during the reactions they catalyze.

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

Most enzymes are proteins.

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

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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 means they remain unchanged after the reaction and can be reused.

Step 2: Analyze the statement 'Enzymes are consumed during the reactions they catalyze.' This is false because enzymes are not consumed; they facilitate the reaction and remain intact afterward.

Step 3: Review the statement 'Enzymes increase the rate of chemical reactions by lowering the activation energy.' This is true. Enzymes work by reducing the energy barrier (activation energy) required for a reaction to proceed, making the process faster.

Step 4: Examine the statement 'Most enzymes are proteins.' This is true. While some RNA molecules (ribozymes) can act as enzymes, the majority of enzymes are protein-based.

Step 5: Evaluate the statement 'Enzyme activity can be affected by changes in pH and temperature.' This is true. Enzymes have optimal pH and temperature ranges, and deviations from these conditions can alter their structure and function, potentially reducing their activity.