Question

who discovered the structure of insulin?
a peter agre
b kurt alder
c richard abegg
d frederick sanger

Explanation:

Frederick Sanger determined the amino - acid sequence of insulin, which is related to its structure. The others are not associated with insulin structure discovery. Peter Agre is known for aquaporin discovery, Kurt Alder for the Diels - Alder reaction, and Richard Abegg for Abegg's rule.

Answer:

d. Frederick Sanger