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

4. Protein Structure

Beta Sheet

Biochemistry

4. Protein Structure

Beta Sheet

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Multiple Choice

Which set of φ and ψ bond angles is best for β-sheet secondary structure?

+ Phi (φ) angles & - Psi (ψ) angles.

- Phi (φ) angles & + Psi (ψ) angles.

+ Phi (φ) angles & + Psi (ψ) angles.

- Phi (φ) angles & - Psi (ψ) angles.

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Verified step by step guidance

Understand the context: In protein secondary structures, the φ (phi) and ψ (psi) angles are the dihedral angles that describe the conformation of the polypeptide chain. These angles are crucial in determining the structure of proteins, such as α-helices and β-sheets.

Recall the Ramachandran plot: This plot is a graphical representation of the φ and ψ angles that are allowed in proteins. Different regions of the plot correspond to different types of secondary structures.

Identify the region for β-sheets: On the Ramachandran plot, β-sheets are typically found in the top left quadrant, which corresponds to negative φ angles and positive ψ angles.

Analyze the options: Compare the given options with the typical φ and ψ angles for β-sheets. The correct set of angles should match the region on the Ramachandran plot where β-sheets are located.

Conclude the best set of angles: Based on the analysis, the set of angles that best represents the β-sheet structure is negative φ angles and positive ψ angles.