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

30. Peptides and Proteins

Secondary Protein Structure

Organic Chemistry

30. Peptides and Proteins

Secondary Protein Structure

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Multiple Choice

Which of the following statements is true in regard to the peptide strand shown?

The β-sheet defines the primary structure of the peptide strand.

The C-Terminal end possesses an α-helix.

Along with its α-helix counterpart, the β-sheet is mainly stabilized by backbone hydrogen bonds.

The α-helix and the β-sheet are connected together through an ionic bond.

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Verified step by step guidance

Examine the peptide strand image provided. Note the presence of an α-helix at the N-terminal and a β-sheet at the C-terminal.

Understand the structural hierarchy of proteins: primary structure refers to the sequence of amino acids, secondary structure includes α-helices and β-sheets, tertiary structure is the overall 3D shape, and quaternary structure involves multiple peptide chains.

Recognize that the β-sheet and α-helix are examples of secondary structures, which are stabilized by hydrogen bonds between the backbone atoms of the peptide chain.

Identify that the statement 'The β-sheet defines the primary structure of the peptide strand' is incorrect because β-sheets are part of the secondary structure, not the primary structure.

Clarify that the statement 'Along with its α-helix counterpart, the β-sheet is mainly stabilized by backbone hydrogen bonds' is true, as both α-helices and β-sheets are stabilized by hydrogen bonds between the backbone atoms.