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- https://bio.libretexts.org/Courses/Coastline_College/ENVS_C100%3A_Environmental_Science_(Hoerer)/02%3A_Environmental_Chemistry/2.02%3A_Supplemental_Modules_(Environmental_Chemistry)/2.2.04%3A_Biochemical_Cycles/2.2.4.03%3A_Nitrogen_CycleNitrogen in the air becomes a part of biological matter mostly through the actions of bacteria and algae in a process known as nitrogen fixation. Legume plants such as clover, alfalfa, and soybeans fo...Nitrogen in the air becomes a part of biological matter mostly through the actions of bacteria and algae in a process known as nitrogen fixation. Legume plants such as clover, alfalfa, and soybeans form nodules on the roots where nitrogen fixing bacteria take nitrogen from the air and convert it into ammonia, NH3. The ammonia is further converted by other bacteria first into nitrite ions and then into nitrate ions.
- https://bio.libretexts.org/Courses/Coastline_College/ENVS_C100%3A_Environmental_Science_(Hoerer)/02%3A_Environmental_Chemistry/2.02%3A_Supplemental_Modules_(Environmental_Chemistry)/2.2.04%3A_Biochemical_Cycles
- https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/Biology_(Kimball)/02%3A_The_Molecules_of_Life/2.07%3A_Amino_AcidsThis page explains that amino acids, the building blocks of proteins, come in 20 types. Each has a unique "R" group affecting its properties, with nine essential amino acids required from the diet, in...This page explains that amino acids, the building blocks of proteins, come in 20 types. Each has a unique "R" group affecting its properties, with nine essential amino acids required from the diet, including histidine and leucine. It highlights the importance for vegetarians to ensure sufficient intake of lysine and tryptophan, which are commonly deficient in plant proteins.
- https://bio.libretexts.org/Courses/Coastline_College/ENVS_C100%3A_Environmental_Science_(Hoerer)/02%3A_Environmental_Chemistry/2.02%3A_Supplemental_Modules_(Environmental_Chemistry)/2.2.04%3A_Biochemical_Cycles/2.2.4.02%3A_Carbon_CycleThe simplified version of this chemical reaction is to utilize carbon dioxide molecules from the air and water molecules and the energy from the sun to produce a simple sugar such as glucose and oxyge...The simplified version of this chemical reaction is to utilize carbon dioxide molecules from the air and water molecules and the energy from the sun to produce a simple sugar such as glucose and oxygen molecules as a by product. Some of the dissolved carbon dioxide remains in the water, the warmer the water the less carbon dioxide remains in the water. As the shelled organisms die, bits and pieces of the shells fall to the bottom of the oceans and accumulate as sediments.
