BI276 Final: Microbes Final Exam .docx
Document Summary
Must coordinate chemical reactions: metabolism: anabolic: energy requiring, catabolic: energy releasing. Macronutrients: required by cells in high amounts, o, h, c,n p, s, k ,mg, ca, na typical bacterial cell is approximately 50% carbon (by dry weight) important for some microbes ( marine organisms, salty habitats) Micronutrients: required by cells in low amounts, iron (fe) Key component of cytochromes and fes proteins in etc. Anoxic conditions ferrous (fe 2=) form; soluble. Oxic conditions = ferric (fe3+) forms; insoluble minerals typical bacterial cell approximately 12% nitrogen (by dry weight) synthesis of nucleic acids and phospholipids sulfur- containing amino acids (cysteine and methionine: carbon (c) Major elements in all classes of macromolecules. Autotrophs use inorganic carbon (co2: nitrogen (n, phosphorous (p, sulfur (s) Vitamins (e. g. thimine, biotin, lipoic acid) and coenzymes a: potassium (k, magnesium (mg) Also required for many enzymes: *calcium (ca) Plays key role in heat stability of endospores: *sodium (na)
