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 criteria is used to classify amino acids into different groups?

The number of peptide bonds they can form

The chemical properties of their side chains (R groups)

Their ability to act as enzymes

The presence of a phosphate group

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Verified step by step guidance

Understand the question: The problem is asking about the criteria used to classify amino acids into different groups. Amino acids are the building blocks of proteins, and their classification is based on specific properties.

Recall the structure of amino acids: Each amino acid has a central carbon atom (α-carbon) bonded to four groups: an amino group (-NH₂), a carboxyl group (-COOH), a hydrogen atom, and a unique side chain (R group). The R group determines the chemical properties of the amino acid.

Identify the key factor for classification: Amino acids are classified based on the chemical properties of their side chains (R groups). These properties include polarity, charge, hydrophobicity, and the presence of specific functional groups.

Eliminate incorrect options: The number of peptide bonds an amino acid can form is not a classification criterion; peptide bonds are formed during protein synthesis. Amino acids do not act as enzymes themselves, although they are components of enzymes. The presence of a phosphate group is not a universal feature of amino acids; it is specific to phosphorylated amino acids.

Conclude the correct answer: The chemical properties of the side chains (R groups) are the primary criteria used to classify amino acids into groups such as polar, nonpolar, acidic, and basic.