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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2:58 minutes

Problem 20a,b

Textbook Question

Identify the N-terminus and the C-terminus for each of the peptides in Problem 10.18.
a. Ala—Asn—Thr
b. DS

Verified step by step guidance

Understand the structure of peptides: Peptides are chains of amino acids linked by peptide bonds. Each peptide has two ends: the N-terminus (amino group, -NH2) and the C-terminus (carboxyl group, -COOH). The N-terminus is the starting point of the peptide chain, and the C-terminus is the ending point.

Examine the peptide sequence provided in Problem 10.18 (not included in the current problem statement). Identify the amino acid at the beginning of the sequence. The free amino group (-NH2) of this amino acid represents the N-terminus.

Identify the amino acid at the end of the peptide sequence. The free carboxyl group (-COOH) of this amino acid represents the C-terminus.

If the peptide sequence is written in the standard format (from N-terminus to C-terminus), the first amino acid in the sequence corresponds to the N-terminus, and the last amino acid corresponds to the C-terminus.

Label the N-terminus and C-terminus for each peptide in Problem 10.18 based on the sequence provided. Ensure that the N-terminus is marked with -NH2 and the C-terminus with -COOH for clarity.

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Key Concepts

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

Peptide Structure

Peptides are short chains of amino acids linked by peptide bonds. Each peptide has a specific orientation, with an N-terminus (amino end) and a C-terminus (carboxyl end). Understanding this structure is crucial for identifying the termini of any peptide sequence.

Amino Acids

Amino acids are the building blocks of peptides and proteins. Each amino acid has a central carbon atom, an amino group, a carboxyl group, and a unique side chain. The sequence and composition of these amino acids determine the properties and functions of the peptide.

Terminology in Biochemistry

In biochemistry, the terms N-terminus and C-terminus refer to the ends of a peptide chain. The N-terminus is where the amino group is located, while the C-terminus is where the carboxyl group is found. Correctly identifying these termini is essential for understanding peptide synthesis and function.