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

Summary of Protein Structure

GOB Chemistry

18. Amino Acids and Proteins

Summary of Protein Structure

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0:26 minutes

Problem 72d

Textbook Question

Identify the level of protein structure associated with each of the following:
d. salt bridges between polypeptides

Verified step by step guidance

Understand that proteins have four levels of structure: primary, secondary, tertiary, and quaternary. Each level describes a different aspect of the protein's organization.

Recall that salt bridges are ionic interactions between positively and negatively charged side chains of amino acids. These interactions contribute to the stabilization of protein structure.

Recognize that the question specifies 'between polypeptides,' which indicates interactions occurring between separate protein chains rather than within a single chain.

Understand that interactions between multiple polypeptide chains are characteristic of the quaternary structure of a protein. This level of structure describes how individual protein subunits assemble and interact to form a functional protein complex.

Conclude that the salt bridges between polypeptides are associated with the quaternary structure of the protein.

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Key Concepts

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

Protein Structure Levels

Proteins have four levels of structure: primary, secondary, tertiary, and quaternary. Each level represents a different aspect of protein organization, from the sequence of amino acids to the overall three-dimensional shape formed by multiple polypeptide chains.

Quaternary Structure

Quaternary structure refers to the assembly of multiple polypeptide chains into a single functional protein complex. This level of structure is stabilized by various interactions, including salt bridges, which are ionic bonds formed between oppositely charged side chains of amino acids.

Salt Bridges

Salt bridges are non-covalent interactions that occur between positively and negatively charged side chains of amino acids. They play a crucial role in stabilizing the quaternary structure of proteins by helping to hold polypeptide chains together, contributing to the protein's overall stability and functionality.