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

Tertiary Protein Structure

GOB Chemistry

18. Amino Acids and Proteins

Tertiary Protein Structure

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Multiple Choice

What type of R group interaction is the most likely between the alanine and isoleucine residues?

Hydrogen bonding

Hydrophobic interaction

Disulfide bridge

Salt bridge

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Verified step by step guidance

Identify the R groups of alanine and isoleucine. Alanine has a methyl group (-CH3) as its side chain, while isoleucine has a more complex hydrocarbon chain.

Understand the nature of the R groups: Both alanine and isoleucine have nonpolar, hydrophobic side chains composed primarily of carbon and hydrogen.

Consider the types of interactions possible between nonpolar R groups. Nonpolar side chains typically engage in hydrophobic interactions due to their tendency to avoid water and associate with each other.

Evaluate the other options: Hydrogen bonding requires polar groups, disulfide bridges require cysteine residues, and salt bridges require charged groups. None of these conditions are met by alanine and isoleucine.

Conclude that the most likely interaction between the alanine and isoleucine residues is a hydrophobic interaction, as both have nonpolar side chains that prefer to interact with each other rather than with water.