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

Antiparallel and Parallel Beta Sheets

Biochemistry

4. Protein Structure

Antiparallel and Parallel Beta Sheets

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Multiple Choice

Silk fibroin contains predominantly β sheet conformation. Which of the following is true regarding its β sheets?

Its antiparallel β sheets are oriented in the same direction.

Its parallel β sheets are oriented in opposite directions.

Its antiparallel β sheets are slightly more extended.

Its parallel β sheets are slightly more extended.

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Verified step by step guidance

Understand the structure of β sheets: β sheets are a type of secondary structure in proteins, characterized by their sheet-like arrangement of backbone strands. These strands can be oriented in parallel or antiparallel directions.

Differentiate between parallel and antiparallel β sheets: In parallel β sheets, the strands run in the same direction, while in antiparallel β sheets, the strands run in opposite directions.

Analyze the stability and extension of β sheets: Antiparallel β sheets are generally more stable due to optimal hydrogen bonding patterns, which can also lead to a slightly more extended conformation compared to parallel β sheets.

Consider the context of silk fibroin: Silk fibroin is known for its high content of β sheet structures, particularly antiparallel β sheets, which contribute to its strength and flexibility.

Conclude with the correct statement: Based on the properties of β sheets and the structure of silk fibroin, the statement 'Its antiparallel β sheets are slightly more extended' is true, reflecting the typical characteristics of antiparallel β sheets.