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

Previous problemNext problem

Struggling with Biochemistry?

Join thousands of students who trust us to help them ace their exams!Watch the first video

Multiple Choice

Which of the following statements concerning enzymes is false?

Enzymes are consumed during the reactions they catalyze.

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

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

Most enzymes are proteins, though some RNA molecules can also have catalytic activity.

Previous problemNext problem

Verified step by step guidance

Step 1: Begin by understanding the role of enzymes in biochemical reactions. Enzymes are biological catalysts that speed up reactions by lowering the activation energy required for the reaction to proceed. This is a fundamental property of enzymes.

Step 2: Analyze the statement 'Enzymes are consumed during the reactions they catalyze.' Enzymes are not consumed or permanently altered during the reaction; they remain intact and can be reused for subsequent reactions. This statement is false.

Step 3: Evaluate the statement 'Enzyme activity can be affected by changes in pH and temperature.' Enzymes are sensitive to environmental conditions, and their activity can be significantly influenced by pH and temperature. Extreme changes can denature enzymes, rendering them inactive. This statement is true.

Step 4: Consider the statement 'Enzymes increase the rate of chemical reactions by lowering the activation energy.' This is a core principle of enzyme function. By lowering the activation energy, enzymes make it easier for reactants to convert into products. This statement is true.

Step 5: Examine the statement 'Most enzymes are proteins, though some RNA molecules can also have catalytic activity.' While most enzymes are indeed proteins, certain RNA molecules, known as ribozymes, also exhibit catalytic activity. This statement is true.