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

12. Biosignaling

Insulin Receptor

Biochemistry

12. Biosignaling

Insulin Receptor

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Multiple Choice

Insulin binds to a receptor that:
I. Is coupled to a G protein.
II. Possesses tyrosine kinase activity.
III. Possesses serine/threonine phosphatase activity.
IV. Interacts with the adapter protein IRS-1.

I, III and V.

II and IV.

I, II and V.

II, IV and V.

IV and V.

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Verified step by step guidance

Understand the role of insulin in the body: Insulin is a hormone that regulates glucose uptake and metabolism. It binds to specific receptors on the cell surface to initiate its effects.

Identify the type of receptor insulin binds to: Insulin binds to the insulin receptor, which is a type of receptor tyrosine kinase. This means it has intrinsic tyrosine kinase activity, allowing it to phosphorylate tyrosine residues on certain proteins.

Evaluate the options based on receptor activity: Since the insulin receptor has tyrosine kinase activity, option II is correct. It does not couple with G proteins, so option I is incorrect.

Consider the role of adapter proteins: The insulin receptor interacts with the adapter protein IRS-1 (Insulin Receptor Substrate 1), which is crucial for downstream signaling. This makes option IV correct.

Review the incorrect options: The receptor does not possess serine/threonine phosphatase activity, so option III is incorrect. Therefore, the correct answer is the combination of options II and IV.