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 pair of amino acids can have ionic interactions?

Serine and Threonine

Leucine and Valine

Aspartate and Lysine

Phenylalanine and Tryptophan

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Verified step by step guidance

Understand the concept of ionic interactions: Ionic interactions occur between oppositely charged groups, such as a positively charged amino group and a negatively charged carboxyl group in amino acids.

Identify the chemical properties of the amino acids listed: Serine and Threonine are polar but uncharged, Leucine and Valine are nonpolar, Phenylalanine and Tryptophan are aromatic and nonpolar, and Aspartate and Lysine are charged (Aspartate is negatively charged, Lysine is positively charged).

Recognize that ionic interactions require one amino acid with a positive charge and another with a negative charge. This eliminates pairs like Serine and Threonine, Leucine and Valine, and Phenylalanine and Tryptophan, as none of these pairs have oppositely charged groups.

Focus on Aspartate and Lysine: Aspartate has a negatively charged carboxylate group (-COO⁻) in its side chain, and Lysine has a positively charged amino group (-NH₃⁺) in its side chain, making them capable of forming ionic interactions.

Conclude that Aspartate and Lysine are the correct pair for ionic interactions due to their complementary charges, which allow them to attract and interact electrostatically.