Evaluate the significance of the insulin receptor's structure in its function as a receptor tyrosine kinase.

• A. The insulin receptor's structure, with alpha and beta subunits, is crucial for its function in autophosphorylation and signaling.
• B. The insulin receptor's structure allows it to function independently of insulin binding.
• C. The insulin receptor's structure prevents it from interacting with insulin receptor substrates.
• D. The insulin receptor's structure is irrelevant to its function as a receptor tyrosine kinase.

Answer: (A)