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

All amino acids, such as the four represented in the figure, contain __________.

two carboxyl groups and a sulfur atom

a benzene ring and a hydroxyl group

an amino group, a carboxyl group, a hydrogen atom, and a unique R group attached to a central (alpha) carbon

a phosphate group and a methyl group

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Verified step by step guidance

Step 1: Understand the structure of amino acids. Amino acids are the building blocks of proteins and share a common structure. Each amino acid contains a central (alpha) carbon atom to which four groups are attached.

Step 2: Identify the four groups attached to the alpha carbon. These include: (1) an amino group (-NH₂), (2) a carboxyl group (-COOH), (3) a hydrogen atom, and (4) a unique side chain (R group) that varies among different amino acids.

Step 3: Recognize that the R group is what differentiates one amino acid from another. The R group can be as simple as a hydrogen atom (as in glycine) or a complex structure like a benzene ring (as in phenylalanine).

Step 4: Eliminate incorrect options based on the structure of amino acids. For example, amino acids do not universally contain two carboxyl groups, a sulfur atom, a benzene ring, or a phosphate group.

Step 5: Conclude that the correct answer is: 'an amino group, a carboxyl group, a hydrogen atom, and a unique R group attached to a central (alpha) carbon,' as this describes the fundamental structure of all amino acids.