, lives in New Delhi. I think it must be TAJ MAHAL.because the construction price in 1632 was 32 million rupees. at that time india was super power in world. so if you compare 32millions rupees with today's rupees then taj must be most expensive.
The carbonic anhydrases (or carbonate dehydratases) form a family of enzymes that catalyze the rapid interconversion of carbon dioxide and water to bicarbonate and protons (or vice versa), a reversible reaction that occurs relatively slowly in the absence of a catalyst.
Carbonic anhydrase is found in the blood, acting to regulate the pH of the blood and to move carbon dioxide from the tissues to the lungs in a non-gasseous form. Carbonic anhydrase enzymes occur in all living things. They can be found in bacterias,plants, mammals. They are the source of the fuel(H+---hydrogen ion).