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

1. Introduction to Biochemistry

Functional Groups

Biochemistry

1. Introduction to Biochemistry

Functional Groups

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Multiple Choice

Which of the following functional groups confers acidic properties to amino acids?

Hydroxyl group (\(-OH\))

Carboxyl group (\(-COOH\))

Sulfhydryl group (\(-SH\))

Amino group (\(-NH_2\))

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Verified step by step guidance

Understand the concept of acidic properties: Acidic properties in molecules are typically conferred by functional groups that can donate a proton ( ext{H}^+) to the surrounding environment, lowering the pH.

Examine the carboxyl group ( ext{-COOH}): The carboxyl group contains a hydroxyl group ( ext{-OH}) attached to a carbon atom that is also double-bonded to an oxygen atom. This group can ionize by losing a proton ( ext{H}^+), forming a negatively charged carboxylate ion ( ext{-COO}^-). This ability to donate a proton makes it acidic.

Compare the hydroxyl group ( ext{-OH}): While the hydroxyl group is polar and can form hydrogen bonds, it does not readily donate a proton under physiological conditions, so it does not confer significant acidic properties.

Analyze the sulfhydryl group ( ext{-SH}): The sulfhydryl group is involved in forming disulfide bonds and is not strongly acidic under physiological conditions. It does not readily donate a proton like the carboxyl group.

Evaluate the amino group ( ext{-NH}_2): The amino group is basic rather than acidic. It tends to accept a proton ( ext{H}^+) rather than donate one, which is the opposite of what is required for acidic properties.