, 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.
Bicarbonate is CO 2 - with an OH group attached. When the bicarbonate reaches the lungs, it is transformed back to carbon dioxide, so it can be exhaled from the body. Carbonic anhydrase converts carbon dioxide to bicarbonate in a reversible reaction, primarily in red blood cells.