Hemoglobin is a functional protein that transports oxygen. Which structural level describes the assembly of its multiple polypeptide subunits into a single unit?
Q1. Hemoglobin is a functional protein that transports oxygen. Which structural level describes the assembly of its multiple polypeptide subunits into a single unit?
Answer: Aggregation of four polypeptide chains
Explanation: Hemoglobin consists of four polypeptide chains (two alpha, two beta). Myoglobin is a single polypeptide and lacks quaternary structure.