Presentation on theme: "AP Biology 2006-2007 Cellular Respiration Harvesting Chemical Energy ATP."— Presentation transcript:
AP Biology Cellular Respiration Harvesting Chemical Energy ATP
AP Biology The Point is to Make ATP! ATP Whats the point? Whoa! HOT stuff!
AP Biology Harvesting stored energy Energy is stored in organic molecules ____________________________________ ____________ eat these organic molecules food digest organic molecules to get… ____________________________________ controlled release of energy burning fuels in a series of step-by-step enzyme-controlled reactions
AP Biology Harvesting energy stored in glucose Glucose is the model ____________________________________ C 6 H 12 O 6 6O 2 6CO 2 6H 2 OATP + ++ CO 2 + H 2 O + heat fuel (carbohydrates) COMBUSTION = making a lot of heat energy by burning fuels in one step RESPIRATION = making ATP (& less heat) by burning fuels in many small steps CO 2 + H 2 O + ATP (+ heat) ATP glucose glucose + oxygen carbon + water + energy dioxide respiration O2O2 O2O2 enzymes + heat
AP Biology How do we harvest energy from fuels? Digest large molecules into smaller ones break bonds & move electrons from one molecule to another as electrons move they carry energy with them that energy is stored in another bond, released as heat, or harvested to make ATP e-e- ++ e-e- +– loses e-gains e-oxidizedreduced REDOX e-e-
AP Biology How do we move electrons in biology? Moving electrons in living systems electrons cannot move alone in cells electrons move as part of H atom _____________________________________ p e + H + H +– loses e-gains e-oxidizedreduced oxidationreduction C 6 H 12 O 6 6O 2 6CO 2 6H 2 OATP +++ oxidation reduction H
AP Biology Coupling oxidation & reduction REDOX reactions in respiration release energy as break down organic molecules break C-C bonds strip off electrons from C-H bonds by removing H atoms C 6 H 12 O 6 CO 2 = __________________________ electrons attracted to more electronegative atoms in biology, the most electronegative atom? O 2 H 2 O = _______________________________ __________________________________________ __________________________________________ __ C 6 H 12 O 6 6O 2 6CO 2 6H 2 OATP +++ oxidation reduction O2O2
AP Biology Oxidation & reduction Oxidation ______________ Reduction ______________ C 6 H 12 O 6 6O 2 6CO 2 6H 2 OATP +++ oxidation reduction
AP Biology Moving electrons in respiration __________________ move electrons by shuttling H atoms around NAD + NADH (reduced) FAD +2 FADH 2 (reduced) + H reduction oxidation P O–O– O–O– O –O–O P O–O– O–O– O –O–O C C O NH 2 N+N+ H adenine ribose sugar phosphates NAD + nicotinamide Vitamin B3 niacin P O–O– O–O– O –O–O P O–O– O–O– O –O–O C C O NH 2 N+N+ H H NADH carries electrons as a reduced molecule reducing power! like $$ in the bank
AP Biology Overview of cellular respiration 4 metabolic stages _______________________ 1. ______________________ respiration without O 2 in cytosol _______________________ respiration using O 2 in mitochondria 2. ______________________ 3. ______________________ 4. ______________________ C 6 H 12 O 6 6O 2 6CO 2 6H 2 OATP +++ (+ heat )
AP Biology The Point is to Make ATP! ATP Whats the point?
AP Biology ___________________ __________________ conformational changes bond P i to ADP to make ATP __________________ allow the H + to flow down concentration gradient through ATP synthase ADP + P i ATP H+H+ ADP + P i H+H+ H+H+ H+H+ H+H+ H+H+ H+H+ H+H+ H+H+ And how do we do that? ATP
AP Biology H+H+ ADP + P i H+H+ H+H+ H+H+ H+H+ H+H+ H+H+ H+H+ H+H+ ATP Got the Energy? Ask Questions!