Question

Myoglobin and the subunits of hemoglobin have ___________

(a) Very different primary and tertiary structures

(b) Very similar primary and tertiary structures

(c) Very similar primary structures, but different tertiary structures

(d) Very similar tertiary structures, but different primary structures

I have been asked this question by my college director while I was bunking the class.

Enquiry is from Reversible Binding of a Protein to a Ligand: Oxygen-Binding Proteins in portion Three Dimensional Structure Of Proteins and Protein Function of Biochemistry

Answer 1

The correct option is (d) Very similar tertiary structures, but different primary structures

To explain I would say: Hemoglobin is a tetramer and myoglobin is a monomer.