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

Catalysis

Biochemistry

6. Enzymes and Enzyme Kinetics

Catalysis

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Multiple Choice

Which of the following could not clearly be a contributor to general acid-base catalysis (circle all that apply)?

Lysine.

Glutamic acid.

Water.

Tyrosine.

Phenylalanine.

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Verified step by step guidance

Understand the concept of general acid-base catalysis: In biochemistry, general acid-base catalysis involves the donation or acceptance of a proton (H+) by an acid or base to stabilize the transition state of a reaction, thereby lowering the activation energy and increasing the reaction rate.

Identify the functional groups involved in acid-base catalysis: Amino acids with side chains that can donate or accept protons are typically involved in acid-base catalysis. These include amino acids with carboxyl, amino, or hydroxyl groups.

Evaluate each amino acid option: Consider the side chain properties of each amino acid listed. Lysine has an amino group, Glutamic acid has a carboxyl group, and Tyrosine has a hydroxyl group, all of which can participate in proton transfer.

Consider the role of water: Water can act as both an acid and a base, making it a potential contributor to acid-base catalysis through its ability to donate or accept protons.

Analyze Phenylalanine: Phenylalanine has a non-polar, aromatic side chain that lacks functional groups capable of donating or accepting protons, making it unlikely to participate in general acid-base catalysis.