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

Charged Amino Acids

Biochemistry

3. Amino Acids

Charged Amino Acids

Previous problemNext problem

Struggling with Biochemistry?

Join thousands of students who trust us to help them ace their exams!Watch the first video

Multiple Choice

Which of the following amino acids does not have a basic R-group?

Previous problemNext problem

Verified step by step guidance

First, understand what is meant by a 'basic R-group' in the context of amino acids. A basic R-group is one that can accept protons (H+) and typically has a positive charge at physiological pH. Common examples include amino acids with side chains containing amine groups.

Next, identify the amino acids represented by the single-letter codes given in the problem: H, S, R, and K. These correspond to Histidine (H), Serine (S), Arginine (R), and Lysine (K), respectively.

Examine the side chains (R-groups) of each of these amino acids: Histidine has an imidazole group, Arginine has a guanidinium group, and Lysine has an amino group. All of these groups can accept protons, making them basic.

Consider the side chain of Serine. Serine has a hydroxyl group (-OH) in its side chain, which is neutral and does not accept protons, thus it is not basic.

Conclude that among the given amino acids, Serine (S) is the one that does not have a basic R-group, as its side chain is neutral and does not participate in proton acceptance.