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

1. Introduction to Biochemistry

Proteins

Biochemistry

1. Introduction to Biochemistry

Proteins

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Multiple Choice

Pepsin enzymatically digests which of the following macromolecules in the stomach?

Carbohydrates

Nucleic acids

Proteins

Lipids

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Verified step by step guidance

Pepsin is a digestive enzyme secreted by the stomach in its inactive form, pepsinogen, which is activated by the acidic environment (low pH) of the stomach.

Pepsin specifically targets proteins, breaking them down into smaller peptides by cleaving peptide bonds. This process is known as proteolysis.

Carbohydrates, nucleic acids, and lipids are not substrates for pepsin. These macromolecules are digested by other enzymes such as amylase (carbohydrates), lipase (lipids), and nucleases (nucleic acids).

The acidic pH of the stomach is crucial for pepsin's activity, as it denatures proteins, making them more accessible for enzymatic cleavage.

Thus, pepsin enzymatically digests proteins in the stomach, contributing to the initial stages of protein digestion before further breakdown occurs in the small intestine.