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 substances participates in the digestion of proteins?

Lactase

Lipase

Pepsin

Amylase

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Verified step by step guidance

Understand the role of enzymes in digestion: Enzymes are biological catalysts that speed up the breakdown of macromolecules into smaller units. Proteins are broken down into amino acids by specific enzymes.

Identify the function of each enzyme listed: Lactase breaks down lactose (a sugar found in milk), lipase breaks down lipids (fats), amylase breaks down carbohydrates (starch), and pepsin is involved in protein digestion.

Focus on protein digestion: Proteins are large macromolecules that need to be broken down into smaller peptides and amino acids for absorption. Pepsin is a protease enzyme that specifically catalyzes the hydrolysis of peptide bonds in proteins.

Understand where pepsin works: Pepsin is active in the stomach, where the acidic environment (low pH) activates its precursor, pepsinogen, into its active form. This acidic environment is crucial for pepsin's function.

Conclude that pepsin is the correct answer: Based on the functions of the enzymes listed, pepsin is the enzyme that participates in the digestion of proteins.