The structure of myoglobin is shown below. Which level of architecture does this protein lack?
A) This protein has all levels of architecture.
B) primary
C) secondary
D) tertiary
E) quaternary

Question

The structure of myoglobin is shown below. Which level of architecture does this protein lack? 
A) This protein has all levels of architecture. 
B) primary 
C) secondary 
D) tertiary 
E) quaternary

Quizplus · Accepted Answer

Myoglobin is a single polypeptide chain and therefore lacks quaternary structure, which refers to the arrangement of multiple protein subunits. The primary structure (amino acid sequence), secondary structure (alpha helices and beta sheets), and tertiary structure (overall 3D shape) are all present in myoglobin.

The Structure of Myoglobin Is Shown Below