Table of contents

1. Matter and Measurements4h 31m
2. Atoms and the Periodic Table5h 23m
3. Ionic Compounds2h 18m
4. Molecular Compounds2h 18m
5. Classification & Balancing of Chemical Reactions3h 17m
6. Chemical Reactions & Quantities2h 27m
7. Energy, Rate and Equilibrium3h 46m
8. Gases, Liquids and Solids3h 25m
9. Solutions4h 10m
10. Acids and Bases3h 29m
11. Nuclear Chemistry56m
BONUS: Lab Techniques and Procedures1h 38m
BONUS: Mathematical Operations and Functions47m
12. Introduction to Organic Chemistry1h 34m
13. Alkenes, Alkynes, and Aromatic Compounds2h 12m
14. Compounds with Oxygen or Sulfur1h 6m
15. Aldehydes and Ketones1h 1m
16. Carboxylic Acids and Their Derivatives1h 11m
17. Amines39m
18. Amino Acids and Proteins1h 51m
19. Enzymes1h 37m
20. Carbohydrates1h 41m
21. The Generation of Biochemical Energy2h 8m
22. Carbohydrate Metabolism2h 22m
23. Lipids2h 26m
24. Lipid Metabolism1h 45m
25. Protein and Amino Acid Metabolism1h 37m
26. Nucleic Acids and Protein Synthesis2h 54m

18. Amino Acids and Proteins

Peptides

GOB Chemistry

18. Amino Acids and Proteins

Peptides

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5:10 minutes

Problem 64

Textbook Question

Draw the structure of the possible dipeptides formed from one alanine combining with one cysteine.

Verified step by step guidance

Identify the amino acids involved: Alanine (Ala) and Cysteine (Cys).

Understand that a dipeptide is formed by a peptide bond between the carboxyl group of one amino acid and the amino group of another.

Consider the two possible combinations: Alanine can be the N-terminal (first) or the C-terminal (second) amino acid.

For the first dipeptide, form a peptide bond between the carboxyl group of Alanine and the amino group of Cysteine, resulting in Ala-Cys.

For the second dipeptide, form a peptide bond between the carboxyl group of Cysteine and the amino group of Alanine, resulting in Cys-Ala.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Amino Acids

Amino acids are organic compounds that serve as the building blocks of proteins. Each amino acid has a central carbon atom, an amino group, a carboxyl group, a hydrogen atom, and a variable side chain (R group) that determines its unique properties. In this case, alanine and cysteine are two specific amino acids, each with distinct side chains that influence the characteristics of the resulting dipeptide.

Dipeptide Formation

A dipeptide is formed when two amino acids undergo a condensation reaction, resulting in the release of a water molecule. This process involves the carboxyl group of one amino acid reacting with the amino group of another, creating a peptide bond. Understanding this reaction is crucial for drawing the correct structure of the dipeptide formed from alanine and cysteine.

Peptide Bond

A peptide bond is a covalent bond that links two amino acids together in a protein or peptide chain. It is formed through a dehydration synthesis reaction, where the carboxyl group of one amino acid reacts with the amino group of another, releasing water. Recognizing the nature of peptide bonds is essential for accurately depicting the structure of dipeptides, including the specific bond formed between alanine and cysteine.