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

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Multiple Choice

Circle all the following amino acids with a basic R-group?

Asp

Lys

Asn

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Verified step by step guidance

Understand the structure of amino acids: Amino acids have a central carbon atom (alpha carbon) bonded to an amino group, a carboxyl group, a hydrogen atom, and a variable R-group (side chain). The nature of the R-group determines the properties of the amino acid.

Identify the basic amino acids: Basic amino acids have R-groups that can accept protons (H+), making them positively charged at physiological pH. The common basic amino acids are lysine (Lys), arginine (Arg), and histidine (His).

Analyze the given amino acids: The problem lists several amino acids by their three-letter codes: Asp (Aspartic acid), Lys (Lysine), A (Alanine), E (Glutamic acid), and Asn (Asparagine).

Determine the nature of each amino acid's R-group: Aspartic acid (Asp) and glutamic acid (E) have acidic R-groups, alanine (A) has a nonpolar R-group, and asparagine (Asn) has a polar but neutral R-group. Lysine (Lys) has a basic R-group.

Circle the amino acid with a basic R-group: Based on the analysis, Lysine (Lys) is the only amino acid in the list with a basic R-group. Therefore, circle Lysine as the amino acid with a basic R-group.