Which type of protein structure is illustrated by this image of bacterial protein G?
A)primary
B)secondary
C)tertiary
D)quaternary
E)helical

Question

Which type of protein structure is illustrated by this image of bacterial protein G? 
A)primary 
B)secondary 
C)tertiary 
D)quaternary 
E)helical

Quizplus · Accepted Answer

The image shows the folded, three-dimensional structure of the protein, which corresponds to its tertiary structure. The primary structure is simply the amino acid sequence, the secondary structure refers to local folding patterns such as alpha helices and beta sheets, and the quaternary structure refers to the arrangement of multiple protein subunits. The term "helical" is too broad and could refer to either secondary or tertiary structures.

Which Type of Protein Structure Is Illustrated by This Image