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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2:41 minutes

Problem 20d

Textbook Question

Identify the N-terminus and the C-terminus for each of the peptides in Problem 10.18.
d. IYP

Verified step by step guidance

Understand the structure of peptides: Peptides are chains of amino acids linked by peptide bonds. Each peptide has two distinct 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 (refer to the peptide sequence in your textbook or materials). The sequence is written from the N-terminus to the C-terminus by convention.

Identify the N-terminus: Look at the first amino acid in the sequence. The free amino group (-NH₂) on this amino acid marks the N-terminus of the peptide.

Identify the C-terminus: Look at the last amino acid in the sequence. The free carboxyl group (-COOH) on this amino acid marks the C-terminus of the peptide.

Label the N-terminus and C-terminus clearly: Once you have identified the ends, label them explicitly in the peptide sequence to ensure clarity. For example, write 'N-terminus' next to the first amino acid and 'C-terminus' next to the last amino acid.

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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.

N-terminus and C-terminus

The N-terminus refers to the end of a peptide that has a free amino group (-NH2), while the C-terminus has a free carboxyl group (-COOH). These termini are essential for determining the directionality of the peptide and play a significant role in its function and interactions.

Amino Acid Sequence

The sequence of amino acids in a peptide determines its properties and function. Each amino acid contributes to the overall structure and behavior of the peptide, making it important to analyze the sequence to accurately identify the N- and C-termini.

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Textbook Question

Identify the N-terminus and the C-terminus for each of the peptides in Problem 10.18.

a. Ala—Asn—Thr

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Textbook Question

Aspartame, which is commonly known as NutraSweet™, contains the following dipeptide:

d. Draw the structure of the isomer of this dipeptide where the C-terminal and N-terminal amino acids are switched.

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Textbook Question

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

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Textbook Question

Identify the N-terminus and the C-terminus for each of the peptides in Problem 10.18.

c. Val—Arg

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Textbook Question

Identify the N-terminal and C-terminal amino acids of the peptide.

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Textbook Question

Identify the amino acids present in the peptide shown and name the peptide using the three-letter abbreviations.

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Textbook Question

Write structural formulas for the two dipeptides that contain leucine and aspartate.

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Textbook Question

Use the three-letter abbreviations to name all tripeptides that contain valine, methionine, and leucine.

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Identify the N-terminus and the C-terminus for each of the peptides in Problem 10.18.d. IYP

Key Concepts

Peptide Structure

N-terminus and C-terminus

Amino Acid Sequence

Watch next

Identify the N-terminus and the C-terminus for each of the peptides in Problem 10.18.
d. IYP