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

Given the amino acid glutamic acid (which has a negatively charged side chain at physiological pH), with which of the following amino acids would it be more likely to form an ionic interaction?

Lysine

Leucine

Serine

Glutamine

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Verified step by step guidance

Step 1: Understand the concept of ionic interactions in biochemistry. Ionic interactions occur between oppositely charged groups, such as a positively charged amino acid side chain and a negatively charged amino acid side chain.

Step 2: Identify the properties of glutamic acid. Glutamic acid has a negatively charged side chain at physiological pH due to its carboxyl group (-COO⁻). This makes it capable of forming ionic interactions with positively charged amino acids.

Step 3: Analyze the properties of the given amino acids. Lysine has a positively charged side chain at physiological pH due to its amino group (-NH₃⁺). Leucine, serine, and glutamine have neutral side chains and cannot form ionic interactions with glutamic acid.

Step 4: Match the oppositely charged amino acids. Since glutamic acid is negatively charged, it will most likely form an ionic interaction with lysine, which is positively charged.

Step 5: Conclude that lysine is the amino acid most likely to form an ionic interaction with glutamic acid, based on their complementary charges at physiological pH.