They fix nitrogen from dinitrogen (N2) in the air using the enzyme nitrogenase, in order to provide the cells in the filament with nitrogen for biosynthesis. Nitrogenase is inactivated by oxygen, so the heterocyst must create a microanaerobic environment.
Vitamin B12 is an especially important vitamin for maintaining healthy nerve cells, and it helps in the production of DNA and RNA, the body's genetic material. Vitamin B12 works closely with vitamin B9, also called folate or folic acid, to help make red blood cells and to help iron work better in the body.
Answered by The Community. Making the world better, one answer at a time. Vitamin B-complex is a dietary supplement combination of all essential B vitamins--vitamins B1, B2, B3, B5, B6, B12, folic acid and biotin. people found this useful. 1  How Vitamin B12 Promotes Weight Loss B-complex vitamins are essential [water-soluble vitamins](http://nutrition.answers.com/vitamins-and-supplements/basic-facts-about-water-soluble-vitamins) that are important fâ¦.