The enzyme that breaks down lactose is: MCQ with Answer and Explanation

Explanation:
Nitrogen fixation, the conversion of atmospheric N2 to ammonia, is performed by certain bacteria and cyanobacteria (blue-green algae). Denitrification is the process where denitrifying bacteria convert nitrates in the soil back into nitrogen gas (N2), returning it to the atmosphere. Ammonification is the decomposition of organic nitrogen into ammonia by microbes; nitrification converts ammonia to nitrate. Thus, statements 1 and 2 are correct.

Explanation:
Robert Koch identified Bacillus anthracis as the causative agent of anthrax in 1876, establishing Koch's postulates for proving microbial disease causation. Pasteur developed vaccines, Jenner smallpox vaccine, Lister antiseptic surgery.

Explanation:
Urobilin is derived from bilirubin, a heme breakdown product, and gives urine its yellow color. R is true and explains A.