Presentation on theme: "Key Words anaerobic process: does not require O2 to occur"— Presentation transcript:
1 Key Words anaerobic process: does not require O2 to occur aerobic process: requires O2 to occurglycolysis: biochemical pathway that breaks down glucose into pyruvic acidpyruvic acid: 3-carbon molecule made from glucose during glycolysisNADH: an energy-carrying moleculefermentation: another pathway that converts glucose into ATP
2 What is Cellular Respiration? how cells receive energy from nutrientsbreaks down organic molecules (ex: sugars) into ATPoccurs in mitochondria (therefore, this occurs in both plants AND animals)
3 Equation for Cellular Respiration C6H12O O CO H20(glucose) (oxygen) (carbon dioxide) (water)------>REACTANTS(starting materials)PRODUCTS(end result)
4 Stages of Cellular Respiration Stage 1 – GLYCOLYSISuses glucose made during photosynthesisbreaks down glucose into 2 molecules of pyruvic acidin the process, a small amount of ATP and NADH is madeWhat comes next depends on one factor…the presence of OXYGEN.
5 Stage 2 NO, there is not O2 present: YES, there is O2 present: Stage 2 = FERMENTATIONcreates lactic acid or ethyl alcoholthese can be converted to ATPinefficient process (wastes energy)Stage 2 = AEROBIC RESPIRATIONHas two stages:Krebs CycleElectron Transport Chain (ETC)
6 Krebs Cycle Picks up where glycolysis left off. Takes 2 molecules of pyruvic acid (made in glycolysis), converts them into various molecules over several cyclesinvolves enzymes such as Co-enzyme APyruvic acid is converted into Acetyl CoA via enzymes. When this occurs, CO2 is produced.End result: 2 molecules of ATP made in each cycleOne glucose molecule will fuel two Krebs Cycle (therefore, 1 glucose -> 4 ATP)
7 Electron Transport Chain similar to photosynthesisoccurs on the inner membrane of mitochondriatransfers electrons throughout several molecules, building up energywhen enough energy is built up (from NADH and FADH2), ATP is createdNADH and FADH2 created during the Krebs Cyclechemiosmosis = production of ATP via chemicals