Table of contents

1. A Review of General Chemistry5h 5m
2. Molecular Representations1h 14m
3. Acids and Bases2h 46m
4. Alkanes and Cycloalkanes4h 17m
5. Chirality3h 39m
6. Thermodynamics and Kinetics1h 22m
7. Substitution Reactions1h 48m
8. Elimination Reactions2h 30m
9. Alkenes and Alkynes2h 9m
10. Addition Reactions3h 19m
11. Radical Reactions1h 58m
12. Alcohols, Ethers, Epoxides and Thiols2h 42m
13. Alcohols and Carbonyl Compounds2h 17m
14. Synthetic Techniques1h 26m
15. Analytical Techniques:IR, NMR, Mass Spect7h 3m
16. Conjugated Systems6h 13m
17. Ultraviolet Spectroscopy51m
18. Aromaticity2h 34m
19. Reactions of Aromatics: EAS and Beyond5h 1m
20. Phenols55m
21. Aldehydes and Ketones: Nucleophilic Addition4h 56m
22. Carboxylic Acid Derivatives: NAS2h 51m
23. The Chemistry of Thioesters, Phophate Ester and Phosphate Anhydrides1h 10m
24. Enolate Chemistry: Reactions at the Alpha-Carbon1h 53m
25. Condensation Chemistry2h 9m
26. Amines1h 43m
27. Heterocycles2h 0m
28. Carbohydrates5h 53m
29. Amino Acids4h 20m
30. Peptides and Proteins2h 42m
31. Catalysis in Organic Reactions1h 30m
32. Lipids 2h 50m
33. The Organic Chemistry of Metabolic Pathways2h 52m
34. Nucleic Acids1h 32m
35. Transition Metals6h 14m
36. Synthetic Polymers1h 49m

29. Amino Acids

Proteins and Amino Acids

Organic Chemistry

29. Amino Acids

Proteins and Amino Acids

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Multiple Choice

Why are proteins considered polymers but not lipids?

Proteins are hydrophilic, whereas lipids are hydrophobic.

Proteins are synthesized in the ribosome, whereas lipids are synthesized in the mitochondria.

Proteins are made of repeating amino acid units, while lipids are not composed of repeating monomeric units.

Proteins contain peptide bonds, while lipids contain ester bonds.

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Verified step by step guidance

Understand the definition of a polymer: A polymer is a large molecule composed of repeating structural units, typically connected by covalent chemical bonds.

Identify the structure of proteins: Proteins are composed of amino acids linked together in a chain by peptide bonds. Each amino acid is a monomer, and the chain of amino acids forms a polymer.

Examine the structure of lipids: Lipids are not composed of repeating monomeric units. They are typically made up of a glycerol backbone bonded to fatty acids, but these components do not repeat in a chain-like structure.

Compare the bonding in proteins and lipids: Proteins contain peptide bonds between amino acids, while lipids contain ester bonds between glycerol and fatty acids. This difference in bonding reflects their structural differences.

Conclude why proteins are considered polymers: Since proteins are made of repeating amino acid units, they fit the definition of a polymer. In contrast, lipids do not have a repeating monomeric structure, so they are not classified as polymers.