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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1:42 minutes

Problem 65d

Textbook Question

What are some differences between each of the following pairs?
d. dipeptides and tripeptides

Verified step by step guidance

Understand the terms: A dipeptide is a molecule composed of two amino acids linked by a single peptide bond, while a tripeptide consists of three amino acids linked by two peptide bonds.

Recall the structure of amino acids: Amino acids are the building blocks of peptides and proteins, and they are linked together through peptide bonds formed by a dehydration reaction between the carboxyl group of one amino acid and the amino group of another.

Identify the key difference: The primary difference between dipeptides and tripeptides is the number of amino acids and peptide bonds. Dipeptides have two amino acids and one peptide bond, while tripeptides have three amino acids and two peptide bonds.

Consider the molecular weight: Tripeptides will have a higher molecular weight than dipeptides because they contain an additional amino acid.

Think about their biological roles: Both dipeptides and tripeptides can have distinct biological functions, but tripeptides may have more complex roles due to their additional amino acid, which can influence their structure and activity.

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Key Concepts

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

Dipeptides

Dipeptides are molecules formed by the linkage of two amino acids through a peptide bond. This bond occurs when the carboxyl group of one amino acid reacts with the amino group of another, releasing a molecule of water in a condensation reaction. Dipeptides play a role in protein synthesis and can influence various biological functions.

Tripeptides

Tripeptides consist of three amino acids connected by two peptide bonds. Similar to dipeptides, the formation of tripeptides involves the condensation of the amino and carboxyl groups of adjacent amino acids. Tripeptides can serve as signaling molecules and may have specific biological activities, often acting as precursors to larger proteins.

Peptide Bonds

Peptide bonds are the covalent bonds that link amino acids together in proteins and peptides. They are formed through a dehydration synthesis reaction, where the carboxyl group of one amino acid reacts with the amino group of another. The nature of peptide bonds influences the structure and function of proteins, as the sequence and number of amino acids determine the properties of the resulting peptide.