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

3. Amino Acids

Amino Acid Groups

Biochemistry

3. Amino Acids

Amino Acid Groups

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Multiple Choice

Which of the following amino acids is classified as basic?

Serine

Lysine

Glutamine

Phenylalanine

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Verified step by step guidance

Understand the classification of amino acids: Amino acids are categorized based on the properties of their side chains (R groups). Basic amino acids have side chains that are positively charged at physiological pH due to the presence of amine groups.

Review the structures of the given amino acids: Serine has a hydroxyl (-OH) group, Glutamine has an amide (-CONH2) group, and Phenylalanine has a benzyl side chain. None of these are basic.

Examine Lysine: Lysine has a long aliphatic chain ending in an amine group (-NH2), which can accept a proton and become positively charged at physiological pH. This makes Lysine a basic amino acid.

Recall the three basic amino acids: Lysine, Arginine, and Histidine are classified as basic due to their positively charged side chains at physiological pH.

Conclude that Lysine is the correct answer because its side chain contains an amine group capable of protonation, classifying it as a basic amino acid.