Final answer:
Hemoglobin is made up of four subunits and binds oxygen in red blood cells, while myoglobin is a monomer found in muscle tissues that stores oxygen.
Step-by-step explanation:
Hemoglobin, or Hb, is a protein molecule found in red blood cells (erythrocytes) made of four subunits: two alpha subunits and two beta subunits. Each subunit surrounds a central heme group that contains iron and binds one oxygen molecule, allowing each hemoglobin molecule to bind four oxygen molecules. Molecules with more oxygen bound to the heme groups are brighter red. Myoglobin, on the other hand, is found in muscle tissues and functions to store oxygen. It is a monomer, made up of a single polypeptide chain.
Therefore, the statements (B) Hemoglobin is found in muscle tissues and (D) Myoglobin is a tetramer, while hemoglobin is a monomer are false.
On the other hand, (C) Both hemoglobin and myoglobin contain iron is true, both proteins contain heme groups which have iron atoms associated with them.