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 best describes the primary function of the enzyme pepsin in the human body?

It digests lipids into fatty acids and glycerol in the small intestine.

It breaks down proteins into smaller peptides in the stomach.

It converts glucose to pyruvate during glycolysis.

It catalyzes the hydrolysis of starch into maltose in the mouth.

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Verified step by step guidance

Step 1: Understand the role of pepsin in the human body. Pepsin is a proteolytic enzyme, meaning it specializes in breaking down proteins into smaller peptides. It is active in the acidic environment of the stomach.

Step 2: Eliminate incorrect options based on the function of pepsin. For example, pepsin does not digest lipids into fatty acids and glycerol; this is the role of lipase enzymes in the small intestine.

Step 3: Consider the option about glucose conversion to pyruvate during glycolysis. This process is catalyzed by enzymes like hexokinase and pyruvate kinase, not pepsin.

Step 4: Evaluate the option about starch hydrolysis into maltose in the mouth. This is the function of salivary amylase, not pepsin.

Step 5: Confirm that the correct answer is the option stating that pepsin breaks down proteins into smaller peptides in the stomach, as this aligns with its primary function.