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

The insulin receptor's structure, with alpha and beta subunits, is crucial for its function in autophosphorylation and signaling.

The insulin receptor's structure allows it to function independently of insulin binding.

The insulin receptor's structure prevents it from interacting with insulin receptor substrates.

The insulin receptor's structure is irrelevant to its function as a receptor tyrosine kinase.