Question Details

Which one of the following enzymes contains ‘Haem’ as the prosthetic group?

Options

A

RuBisCo

B

Carbonic anhydrase

C

Succinate dehydrogenase

D

Catalase

Show Answer

Correct Answer :

Option D

Catalase

Catalase

Solution :

To identify the enzyme that contains 'Haem' (heme) as its prosthetic group, let us analyze each of the options provided:
1. RuBisCo (Ribulose-1,5-bisphosphate carboxylase-oxygenase) is a plant enzyme involved in carbon fixation. It does not require a heme prosthetic group for its activity.
2. Carbonic anhydrase is a zinc-containing metalloenzyme. Its prosthetic group/cofactor is a zinc ion (Zn2+), which is essential for its catalytic activity of interconverting carbon dioxide and water to bicarbonate and protons.
3. Succinate dehydrogenase is an enzyme involved in both the citric acid cycle and the electron transport chain (Complex II). It contains flavin adenine dinucleotide (FAD) and iron-sulfur (Fe-S) clusters as its cofactors, but its primary prosthetic group is FAD.
4. Catalase (along with peroxidase) is an enzyme that catalyzes the breakdown of hydrogen peroxide (H2O2) into water and oxygen. It is a tetrameric protein containing four heme (Haem) groups, which act as the prosthetic group at its active sites.

Therefore, Catalase is the enzyme that contains Haem as the prosthetic group.

The correct answer is Catalase.

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