Question

Cytochromes are _______________.

• A. Riboflavin nucleotides
• B. Pyrimidine nucleotides
• C. Iron porphyrin proteins
• D. Flavoproteins

Answer 1

The correct option is C Iron porphyrin proteins

Cytochromes are iron-porphyrin or heme proteins discovered by MacCunn. Cytochromes are bound to inner mitochondrial membrane and are primarily responsible for the generation of ATP via mitochondrial electron transport system. Whereas all other cytochromes have iron only, the cytochrome a possesses both iron and copper. With iron it picks up electrons and through copper it hands over electrons to oxygen.

Hence C is the correct option.