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 set of words best describes the side chain of the amino acid threonine?

Polar, uncharged, contains a hydroxyl group

Nonpolar, hydrophobic, contains a methyl group

Positively charged, basic, contains an amine group

Negatively charged, acidic, contains a carboxyl group

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Verified step by step guidance

Step 1: Recall the structure of threonine. Threonine is an amino acid with a side chain containing a hydroxyl (-OH) group attached to a carbon atom.

Step 2: Understand the chemical properties of the hydroxyl group. The hydroxyl group is polar because of the electronegativity difference between oxygen and hydrogen, making the side chain hydrophilic.

Step 3: Note that threonine's side chain is uncharged at physiological pH. The hydroxyl group does not gain or lose protons under normal biological conditions, so it remains neutral.

Step 4: Compare the descriptions provided in the options. The correct description should match the chemical properties of threonine's side chain: polar, uncharged, and contains a hydroxyl group.

Step 5: Eliminate the other options based on their inaccuracies. For example, threonine's side chain is not nonpolar or hydrophobic, does not contain a methyl group, is not positively charged or basic, and does not contain a carboxyl group.