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

1. Introduction to Biochemistry

Proteins

Biochemistry

1. Introduction to Biochemistry

Proteins

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Multiple Choice

Which of the following best describes the structure of an immunoglobulin monomer?

Two identical heavy chains and two identical light chains linked by disulfide bonds

Two alpha helices and two beta sheets connected by hydrogen bonds

A single polypeptide chain folded into a globular structure

Four identical polypeptide chains arranged in a tetrameric structure

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Verified step by step guidance

Understand the structure of an immunoglobulin monomer: Immunoglobulins, also known as antibodies, are proteins produced by the immune system to recognize and neutralize foreign substances. Their structure is crucial for their function.

Recall the basic composition of immunoglobulins: Immunoglobulin monomers consist of two identical heavy chains and two identical light chains. These chains are linked together by disulfide bonds, which are covalent bonds formed between sulfur atoms in cysteine residues.

Visualize the arrangement of the chains: The heavy chains form the backbone of the structure, while the light chains are attached to the heavy chains. This arrangement creates a Y-shaped structure, with the antigen-binding sites located at the tips of the arms of the Y.

Eliminate incorrect options: Analyze the other choices provided. For example, 'Two alpha helices and two beta sheets connected by hydrogen bonds' describes secondary structural elements but does not match the immunoglobulin monomer's structure. Similarly, 'A single polypeptide chain folded into a globular structure' and 'Four identical polypeptide chains arranged in a tetrameric structure' do not describe the immunoglobulin monomer.

Conclude with the correct description: The correct answer is 'Two identical heavy chains and two identical light chains linked by disulfide bonds,' as this accurately describes the structure of an immunoglobulin monomer.