Question

The example of Chromoprotein is
(a)Cytochromes
(b)Haemoglobin
(c)Both A and B
(d)None of the above

Answer 1

Hint: A chromoprotein is a conjugated protein that contains a pigmented prosthetic group (known as a cofactor). A common example is a haemoglobin, which contains a heme cofactor, which is the iron-containing molecule that makes oxygenated blood appear red.

Complete answer:
Chromoproteins are conjugate proteins. For examples, chromoproteins include flavoproteins (with FMN or FAD), haemoglobin and cytochromes with iron, rhodopsin with vitamin A, hemocyanin and cytochrome oxidase with copper, chloroplasts with chlorophyll, biliproteins with phycobilins.

Additional Information: -The Electron Transport Chain(ETC) is found in the inner membrane of the mitochondria, consisting of the four complexes.
-The complexes are:
 (a)Complex one - NADH dehydrogenase, NADH ubiquinone oxidoreductase, and mitochondrial complex I.
 (b)Complex two - Succinate dehydrogenase or reductase.
 (c)Complex three - Cytochromes ${ \text{Cyt }{ bc}_{ 1} }$ complex and cytochrome c reductase.
 (d)Complex four - Cytochrome c oxidase, and ${ \text{Cyt }{ a }_{ 3 } }$.

-The iron-containing oxygen-transport metalloprotein in the red blood cells of almost all vertebrates as well as the tissues of some invertebrates is haemoglobin or haemoglobin + -o-+ globulin, abbreviated as Hb or Hgb. Haemoglobin in the blood transfers oxygen to the rest of the body from the lungs or gills.
 The haemoglobin is degraded or broken into globin, the protein component, iron (preserved for later use), and heme (see middle graphic) as the red blood cells disintegrate. Initially, the heme splits into biliverdin, an orange-yellow pigment that is quickly reduced to bilirubin, a green pigment (see bottom graphic).
Calcium is present in abundance in dairy products. It is the end product of casein breakdown. It is present and preserved in bones.
So, the correct answer is ‘Both A and B.’

Note: Chromoproteins absorb visible light and give off colour in ambient light, it gives scientists the ability for instrument-free detection. Unlike the fluorescence or luminescence, which require UV lamps, fluorometers, or luminometers, chromoprotein detection can be done by the naked eye itself.