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

Tertiary Structure of Protein

Biochemistry

4. Protein Structure

Tertiary Structure of Protein

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Multiple Choice

Which of the following best describes the tertiary structure of proteins?

The overall three-dimensional folding of a single polypeptide chain stabilized by interactions between side chains (R groups)

The regular arrangement of polypeptide backbone into α-helices and β-sheets

The linear sequence of amino acids in a polypeptide chain

The association of multiple polypeptide subunits into a functional protein complex

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Verified step by step guidance

Step 1: Begin by understanding the hierarchical levels of protein structure. Proteins have four levels of structure: primary, secondary, tertiary, and quaternary. Each level describes a different aspect of the protein's organization.

Step 2: Recall that tertiary structure refers to the overall three-dimensional folding of a single polypeptide chain. This folding is stabilized by interactions between the side chains (R groups) of amino acids, such as hydrogen bonds, ionic bonds, hydrophobic interactions, and disulfide bridges.

Step 3: Compare tertiary structure to the other levels of protein structure. The primary structure is the linear sequence of amino acids, the secondary structure involves regular arrangements like α-helices and β-sheets formed by hydrogen bonding in the backbone, and the quaternary structure describes the association of multiple polypeptide subunits.

Step 4: Analyze the options provided in the question. Identify which description matches the definition of tertiary structure, focusing on the three-dimensional folding and stabilization by side chain interactions.

Step 5: Select the correct answer based on your analysis. Ensure that the chosen option aligns with the definition of tertiary structure and does not describe primary, secondary, or quaternary structures.