Even though the amino acid sequence between subunits of hemoglobin and myoglobin are not exactly the same, there are other similarities between the two proteins. Which level of protein structure is not found in both molecules?

Answer: The Quaternary structure

Explanation: Myoglobin and hemoglobin are both hemeprotiens with the ability to bind oxygen.

Myoglobin is mainly found in muscle tissue and plays a vital role as an intracellular storage site for oxygen. Myoglobin is a monomeric heme protein and has a secondary and tertiary structure. Hemoglobin is vital for the transportation of oxygen from the lungs to the rest of the body as needed. Hemoglobin is a tetrameric hemeprotien with secondary and tertiary structures.

Both hemoglobin and myoglobin are absent of a quaternary structure.