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 enzyme is correctly matched with its substrate following ingestion of a cheeseburger?

Lipase — starch

Lactase — cellulose

Amylase — triglycerides

Pepsin — proteins

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Verified step by step guidance

Step 1: Begin by identifying the macromolecules present in a cheeseburger. A cheeseburger contains proteins (from meat and cheese), lipids (from cheese and meat fat), carbohydrates (from the bun), and possibly some fiber (from vegetables or whole-grain buns).

Step 2: Understand the role of enzymes in digestion. Enzymes are biological catalysts that break down macromolecules into smaller, absorbable units. Each enzyme is specific to its substrate, meaning it acts on a particular type of molecule.

Step 3: Analyze the enzyme-substrate pairs provided in the question. Lipase acts on lipids (triglycerides), not starch. Lactase breaks down lactose, not cellulose. Amylase digests starch, not triglycerides. Pepsin is a protease that breaks down proteins into smaller peptides.

Step 4: Match the enzyme to the substrate found in a cheeseburger. Proteins are a major component of the cheeseburger (meat and cheese), and pepsin is the enzyme responsible for breaking down proteins in the stomach.

Step 5: Conclude that the correct enzyme-substrate pair is Pepsin — proteins, as pepsin specifically targets proteins, which are abundant in a cheeseburger.