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

Previous problemNext problem

Struggling with Organic Chemistry?

Join thousands of students who trust us to help them ace their exams!Watch the first video

Multiple Choice

What distinguishes a polypeptide from a protein?

A polypeptide is a single linear chain of amino acids, while a protein is one or more polypeptides folded into a functional form.

A polypeptide contains only non-essential amino acids, whereas a protein contains only essential amino acids.

A polypeptide is a fully functional biological molecule, while a protein is not.

A polypeptide is always shorter than a protein, with fewer than 10 amino acids.

Previous problemNext problem

Verified step by step guidance

Understand the basic definitions: A polypeptide is a single, linear chain of amino acids linked by peptide bonds. A protein, on the other hand, is one or more polypeptides that have folded into a specific three-dimensional structure that is functional.

Recognize that the primary distinction between a polypeptide and a protein is the level of structural organization and functionality. Proteins have complex structures that include primary, secondary, tertiary, and sometimes quaternary structures.

Consider the role of amino acids: Both polypeptides and proteins are composed of amino acids. Essential amino acids are those that cannot be synthesized by the body and must be obtained from the diet, while non-essential amino acids can be synthesized by the body.

Evaluate the statement about functionality: A polypeptide may not be functional on its own until it folds into a specific shape or combines with other polypeptides to form a protein.

Assess the length criterion: While polypeptides can vary in length, they are not strictly defined by having fewer than 10 amino acids. Proteins are typically longer and more complex, but the distinction is not solely based on the number of amino acids.