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 statements is true regarding a basic amino acid?

It contains a side chain with a positive charge at physiological pH.

It is always hydrophobic in nature.

It contains a side chain with a carboxyl group.

It cannot participate in hydrogen bonding.

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Verified step by step guidance

Understand the definition of a basic amino acid: Basic amino acids have side chains that are positively charged at physiological pH (around 7.4). Examples include lysine, arginine, and histidine.

Analyze the first statement: 'It contains a side chain with a positive charge at physiological pH.' This aligns with the definition of basic amino acids, as their side chains typically contain functional groups like amines that are protonated and positively charged at physiological pH.

Evaluate the second statement: 'It is always hydrophobic in nature.' Hydrophobicity refers to the tendency to repel water. Basic amino acids are generally hydrophilic due to their charged side chains, which interact well with water. Thus, this statement is incorrect.

Examine the third statement: 'It contains a side chain with a carboxyl group.' Carboxyl groups (-COOH) are characteristic of acidic amino acids, not basic amino acids. Therefore, this statement is incorrect.

Assess the fourth statement: 'It cannot participate in hydrogen bonding.' Basic amino acids can participate in hydrogen bonding due to the presence of polar and charged groups in their side chains. This statement is also incorrect.