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

Enzyme-Substrate Complex

Biochemistry

6. Enzymes and Enzyme Kinetics

Enzyme-Substrate Complex

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Multiple Choice

Which of the following amino acid residues make up the catalytic triad of chymotrypsin?

Threonine, Histidine, Lysine

Tyrosine, Arginine, Aspartate

Serine, Cysteine, Glutamate

Serine, Histidine, Aspartate

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Verified step by step guidance

Understand the concept of a catalytic triad: A catalytic triad is a group of three amino acid residues in the active site of certain enzymes that work together to perform catalysis. In chymotrypsin, the catalytic triad consists of Serine, Histidine, and Aspartate.

Recognize the role of each residue in the catalytic triad: Serine acts as the nucleophile, Histidine serves as a base to activate Serine, and Aspartate stabilizes the positive charge on Histidine during catalysis.

Eliminate incorrect options by analyzing the amino acid properties: For example, Threonine, Lysine, and Tyrosine are not part of the catalytic triad in chymotrypsin because they do not fulfill the specific roles required for catalysis.

Match the correct amino acids to their roles in the catalytic triad: Serine is the nucleophile, Histidine is the base, and Aspartate stabilizes the charge. This combination is unique to the catalytic triad of chymotrypsin.

Confirm the correct answer: Based on the roles and properties of the amino acids, the catalytic triad of chymotrypsin is made up of Serine, Histidine, and Aspartate.