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

Polar Amino Acids

Biochemistry

3. Amino Acids

Polar Amino Acids

Previous problemNext problem

Struggling with Biochemistry?

Join thousands of students who trust us to help them ace their exams!Watch the first video

Multiple Choice

Which of the following amino acids contains a polar R group?

Valine

Phenylalanine

Serine

Leucine

Previous problemNext problem

Verified step by step guidance

Step 1: Understand the concept of polar R groups. Polar R groups are side chains of amino acids that can form hydrogen bonds due to the presence of electronegative atoms like oxygen or nitrogen. These groups are hydrophilic and interact well with water.

Step 2: Analyze the structure of Valine. Valine has a nonpolar, hydrophobic R group consisting of an isopropyl group. This makes it nonpolar and unable to form hydrogen bonds.

Step 3: Examine the structure of Phenylalanine. Phenylalanine has a benzyl group as its R group, which is nonpolar and hydrophobic. It does not contain electronegative atoms capable of forming hydrogen bonds.

Step 4: Investigate the structure of Serine. Serine has a hydroxymethyl (-CH2OH) group as its R group. The hydroxyl (-OH) group is polar due to the electronegativity of oxygen, allowing it to form hydrogen bonds and interact with water.

Step 5: Review the structure of Leucine. Leucine has an isobutyl group as its R group, which is nonpolar and hydrophobic. It does not contain electronegative atoms capable of forming hydrogen bonds.