The pair in which both the species have iron is:

Options

A. nitrgenase, cytochromes
B. carboxypeptidase, haemoglobin
C. haemocyanin. Nitrogenase
D. haemoglobin, cytochromes.

Answer

d

Explanation

Cytochromoes are conjugated protiens consisting of an apoprotein and prosthetic group (heme).
The hence consists ofa prophyrin with a central iron atom.
The name haemoglobin is concatentation of the heme and globin reflectin the fact that each subunit of hemoglobin is a globular protein with an embedded heme ( or haem) grup each heme group contains an iron atom, and this responsible for the binding of oxygen. the most common types of haemoglobin contains four such subunits each, with on eheme gorup.