Question

Cytochrome is a

• A. Mg pyrole ring.
• B. Fe porphyrin ring.
• C. Nucleotide.
• D. Alloy of nichrome.

Answer 1

Answer: (B)

Fe porphyrin ring.

Cytochrome is a carrier molecule in the mitochondria of plant and animal cells, consisting of a protein and an iron containing porphyrin ring and participating in the stepwise transfer of electrons in oxidation reactions.
The heme group is a highly conjugated ring system surrounding a metal ion, which readily interconverts between the oxidation states.