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

If asked to build a model of an amino acid, you would need parts to represent which of the following groups?

An amino group, a carboxyl group, a hydrogen atom, and a unique R group attached to a central carbon

A phosphate group, a methyl group, and a ribose sugar

A benzene ring, a phosphate group, and a fatty acid chain

Two carboxyl groups and a sulfur atom

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Verified step by step guidance

Step 1: Begin by understanding the structure of an amino acid. Amino acids are the building blocks of proteins and share a common structure. Each amino acid consists of a central carbon atom (called the alpha carbon) to which four groups are attached.

Step 2: Identify the four groups attached to the central carbon in an amino acid. 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 for each amino acid.

Step 3: Compare the options provided in the problem to the structure of an amino acid. The correct option should include the amino group, carboxyl group, hydrogen atom, and unique R group attached to the central carbon.

Step 4: Eliminate the incorrect options. For example, a phosphate group, methyl group, and ribose sugar are components of nucleotides, not amino acids. Similarly, a benzene ring, phosphate group, and fatty acid chain are characteristic of lipids, not amino acids. Two carboxyl groups and a sulfur atom do not represent the standard structure of an amino acid.

Step 5: Conclude that the correct answer is the option describing an amino group, a carboxyl group, a hydrogen atom, and a unique R group attached to a central carbon, as this matches the fundamental structure of an amino acid.