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 enzymes acts in the small intestine and is responsible for breaking down proteins into smaller peptides?

Salivary amylase

Trypsin

Pepsin

Hexokinase

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Verified step by step guidance

Understand the role of each enzyme listed in the options. Salivary amylase is involved in carbohydrate digestion, specifically breaking down starch into maltose in the mouth, not proteins. Hexokinase is an enzyme involved in glucose metabolism, not protein digestion.

Recognize that pepsin is a protease enzyme that breaks down proteins into peptides, but it functions in the stomach, not the small intestine.

Learn that trypsin is a protease enzyme secreted by the pancreas in its inactive form (trypsinogen) and activated in the small intestine. It is responsible for breaking down proteins into smaller peptides in the small intestine.

Understand the activation process of trypsin. Trypsinogen is converted into active trypsin by the enzyme enteropeptidase, which is secreted by the cells lining the small intestine.

Conclude that the correct enzyme responsible for breaking down proteins into smaller peptides in the small intestine is trypsin, based on its location and function.