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 Strand

Biochemistry

4. Protein Structure

Beta Strand

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Multiple Choice

Which phrase best describes the hydrogen bonds of a β-strand in silk fibroin, a protein with β-conformations?

They occur mainly near the amino and carboxyl termini of the β-strands.

They are perpendicular to the plane of the two β-strands.

They occur mainly between the atoms of the R groups.

They occur between backbone atoms of adjacent β-strands.

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Verified step by step guidance

Understand the structure of β-strands in proteins: β-strands are a type of secondary structure in proteins, characterized by a zigzag pattern. They can align side by side to form β-sheets.

Identify the role of hydrogen bonds in β-sheets: In β-sheets, hydrogen bonds form between the backbone atoms of adjacent β-strands, specifically between the carbonyl oxygen of one strand and the amide hydrogen of the neighboring strand.

Analyze the image provided: The image shows β-strands aligned side by side, with hydrogen bonds depicted as dashed lines connecting the strands. These bonds are between the backbone atoms, not the R groups or termini.

Consider the options given: The options describe different possible locations for hydrogen bonds in β-strands. The correct description should match the typical hydrogen bonding pattern in β-sheets.

Conclude based on the analysis: The correct phrase is 'They occur between backbone atoms of adjacent β-strands,' as this matches the typical hydrogen bonding pattern in β-sheets, as shown in the image.