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

Peptides

Organic Chemistry

30. Peptides and Proteins

Peptides

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Multiple Choice

Which of the following best represents the backbone arrangement of two peptide bonds in a peptide chain?

C-C-N-C-N-C

N-C-N-C-C-C

C-N-C-C-N-C

N-C-C-N-C-C

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Verified step by step guidance

Understand the structure of a peptide bond: A peptide bond is formed between the carboxyl group of one amino acid and the amino group of another amino acid, resulting in the sequence -C(=O)-NH-. This bond connects the amino acids in a peptide chain.

Identify the repeating unit in a peptide chain: The backbone of a peptide chain consists of repeating units of amino acids linked by peptide bonds. Each amino acid contributes an amine group (N), a central carbon (C), and a carboxyl group (C).

Analyze the sequence options: Look at each option and determine which one correctly represents the sequence of atoms in the backbone of a peptide chain. The backbone should alternate between nitrogen and carbon atoms, reflecting the structure of amino acids linked by peptide bonds.

Consider the correct sequence: The correct sequence should start with a nitrogen atom (from the amine group), followed by a central carbon (from the amino acid), then another carbon (from the carboxyl group), followed by another nitrogen (from the next amino acid's amine group), and so on.

Select the correct option: Based on the analysis, the sequence that best represents the backbone arrangement of two peptide bonds in a peptide chain is N-C-C-N-C-C, reflecting the alternating pattern of nitrogen and carbon atoms in the peptide backbone.