Ch 9 Cellular Respiration Cell Energetics

8.1 Where do living things get E? Heterotrophs – must eat food to get the energy You EAT! Carbohydrate, Lipids, and Proteins ALL get broken down HIGH E bonds in Carbs and Lipids Autotrophs – make their own food using sunlight or other chemicals Photosynthetic autotrophs make sugar from sunlight How ever you get food you use it to make…. ATP (adinosine triphosphate) –

Cellular Respiration ATP Releases ENERGY from the food you eat/make, IF OXYGEN is present ATP

8.3 What is Cellular Respiration? The process of mitochondria (power station of the cell) to break down glucose (from food) to make ATP. There are 3 stages: Glycolysis Krebs Cycle Electron Transport Chain (ETC)

8.3 What is Glycolysis? Anaerobic Location: Cytoplasm Reactant: Glucose Product: 2ATP and 2 molecules of Pyruvic Acid Advantge: it is quick!! No Oxygen needed directly

What is the KrebsCycle? Location: Mitochondria matrix Reactant: Pyruvic Acids (Pyruvate) Product: 2ATP NADH and FADH2 (electron carriers) and CO2 AKA – Citric Acid Cycle

What is the e- Transport Chain Aerobic Location: Inner Mito. membrane Reactants: electrons from KC (NADH and FADH2 drop them off and Oxygen Products: 32 ATP and water

Electron Transport Chain and Oxygen Oxygen is the FINAL ELECTRON ACCEPTOR

What is fermentation? When NO oxygen is present…. Glycolysis still happens, but next step is FERMENTATION Essentially makes enough E to run glycolysis Lactic Acid Fermentation Used by animal cells Produces lactic acid and 2 ATP Alcoholic Fermentation Used by yeast and some bacteria Produces CO2 and ethyl alcohol

Compare and Contrast Photosynthesis Food/Glucose made CO2 taken in O2 given off H20 broken down Requires light Occurs in cells with chlorophyll Cellular Respiration