Table of contents

1. Introduction to Biochemistry4h 34m
2. Water3h 23m
3. Amino Acids8h 10m
4. Protein Structure10h 4m
5. Protein Techniques14h 5m
6. Enzymes and Enzyme Kinetics13h 38m
7. Enzyme Inhibition and Regulation 8h 42m
8. Protein Function 9h 41m
9. Carbohydrates7h 49m
10. Lipids5h 49m
11. Biological Membranes and Transport 6h 37m
12. Biosignaling9h 45m
Review 1: Nucleic Acids, Lipids, & Membranes2h 47m
Review 2: Biosignaling, Glycolysis, Gluconeogenesis, & PP-Pathway3h 12m
Review 3: Pyruvate & Fatty Acid Oxidation, Citric Acid Cycle, & Glycogen Metabolism2h 26m
Review 4: Amino Acid Oxidation, Oxidative Phosphorylation, & Photophosphorylation1h 48m

3. Amino Acids

Amino Acid Groups

Biochemistry

3. Amino Acids

Amino Acid Groups

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Multiple Choice

Which pair of amino acids can form hydrogen bonds between their R groups?

Serine and Threonine

Leucine and Isoleucine

Valine and Phenylalanine

Alanine and Glycine

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Verified step by step guidance

Step 1: Understand the concept of hydrogen bonding. Hydrogen bonds are weak interactions that occur between a hydrogen atom covalently bonded to an electronegative atom (like oxygen or nitrogen) and another electronegative atom. In amino acids, hydrogen bonds can form between polar R groups containing electronegative atoms.

Step 2: Analyze the R groups of each amino acid pair provided. Serine and Threonine have hydroxyl (-OH) groups in their side chains, which are polar and capable of forming hydrogen bonds. Leucine, Isoleucine, Valine, Phenylalanine, Alanine, and Glycine have nonpolar or hydrophobic side chains, which do not favor hydrogen bonding.

Step 3: Compare the chemical structures of the amino acids. Serine has a hydroxymethyl group (-CH2OH) in its R group, and Threonine has a hydroxyl group attached to a methyl group (-CH(OH)CH3). These polar groups can interact via hydrogen bonding.

Step 4: Eliminate pairs with nonpolar R groups. Leucine and Isoleucine, Valine and Phenylalanine, and Alanine and Glycine all have nonpolar or hydrophobic side chains, which are not conducive to hydrogen bonding.

Step 5: Conclude that the pair of amino acids capable of forming hydrogen bonds between their R groups is Serine and Threonine, due to the presence of polar hydroxyl groups in their side chains.