The four types of macromolecules in cells are nucleic acids, lipids, proteins, and carbohydrates.
Blood is constantly processed by some excretory organs even though it is not excreted by the excretory system.
DescriptionNitrification is the biological oxidation of ammonia or ammonium to nitrite followed by the oxidation of the nitrite to nitrate. The transformation of ammonia to nitrite is usually the rate limiting step of nitrification. Nitrification is an important step in the nitrogen cycle in soil.
