CELLULAR RESPIRATION CHAPTER 9 SC B-3.2 Summarize the basic
aerobic & anaerobic processes of cellular respiration &
interpret the equation
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Chapter 9 Section 1 Essential Question: How would you
distinguish the two main types of fermentation?
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CELLULAR RESPIRATION IS THE PROCESS THAT RELEASES ENERGY BY
BREAKING DOWN GLUCOSE IN THE PRESENCE OF OXYGEN
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Cellular Respiration Equation
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CELLULAR RESPIRATION: 3 PARTS IN CYTOPLASM (ANAEROBIC)
GLYCOLYSIS (FERMENTATION in absence of oxygen) IN MITOCHONDRIA
(AEROBIC) KREBS CYCLE (aka CITRIC ACID CYCLE) ELECTRON TRANSPORT
CHAIN & CHEMIOSMOSIS
Slide 7
GLYCOLYSIS GLUCOSE ENTERS CELL VIA FACILITATED DIFFUSION
performed by both prokaryotic and eukaryotic cells GLUC GLUCOSE-6-
PHOSPHATE 2 PYRUVATE (3-carbon molecule) COSTS THE CELL 2 ATP BUT
MAKES 4 ATP (net gain of 2 ATP) 2 NAD+ 2 NADH
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Slide 9
GLYCOLYSIS
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WHAT IT NEEDS: GLUCOSE 2 ATP 4 ADP + 4 P 2NAD+ WHAT IT MAKES:
2- PYRUVATES 2 ADP + 2 P 4 ATP 2 NADH
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FERMENTATION ANAEROBIC IN CYTOPLASM NADH NAD+ (which is used
again in glycolysis) 2 TYPES: ALCOHOLIC YEAST BACTERIA LACTIC ACID
ANIMAL MUSCLE FIBERS
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ALCOHOLIC FERMENTATION
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LACTIC ACID FERMENTATION
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Chapter 9 Section 2: Aerobic Respiration Essential Question How
is energy transferred through the various stages of aerobic
cellular respiration?
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Mitochondrial Structure
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Structure of Mitochondria
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KREBS CYCLE: occurs in matrix 2 PYRUVATE ENTER MITOCHONDRIAL
MATRIX 6 CO 2 CITRIC ACID 1 ST CPD FORMED HENCE aka CITRIC ACID
CYCLE KREBS CYCLE PRODUCTS: 8 NAD+ 8 NADH 2 FAD+ 2 FADH 2 2 ATP 6
CO 2
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FOR EACH MOLECULE OF GLUCOSE: know what comes out the Krebs
Cycle
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Krebs Cycle has many reactions (you do not need to know them)
that releases the carbons from pyruvate as CO2 and transfers
electrons & H+ to NAD+ and FAD NADH & FADH2
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What are NADH & FADH 2 ? they are very similar to NADPH in
photosynthesis They carry electrons from KrebsCycle to electron
transport chain (thats all you need to know about them)
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From the Krebs Cycle, NADH & FADH 2 move to the inner
membrane of the mitochondria (called the cristae) and transfer the
electrons they are carrying to the electron transport chain in the
cristae. As the electrons move down the chain they lose energy some
of which is used to move H+ from the matrix to the intermembrane
space
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ELECTRON TRANSPORT CHAIN - 1 Electron transport chain
activities aka oxidative phosphorylation hi energy e- move thru a
series of e- carrier molecules in the cristae energy from 2 e-
transported down the electron transport chain moves H+ across the
membrane into the intermembrane space (aka the outer membrane
space)
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Inner compartment = matrix outer compartment = intermembrane
space (space between outer membrane of mitochondria and inner
membrane or cristae
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Another look @ electron transport chain
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ELECTRON TRANSPORT CHAIN - 2 Chemiosmosis: process in which the
energy generated by oxidative phosphorylation generates a proton
gradient across the cristae that drives the enzymatic synthesis of
ATP The cristae contain proteins called ATP SYNTHASE which act as a
H+ CHANNEL PROTEIN & as an enzyme: ATP SYNTHASE
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Role of O 2 At the end of the e- transport chain O 2 picks up
the e- and combines with H+ to form H 2 O
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Animations of cellular respiration
http://www.mhhe.com/biosci/bio_animations/MH0
1_CellularRespiration_Web/index.html
http://www.mhhe.com/biosci/bio_animations/MH0
1_CellularRespiration_Web/index.html
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Comparing Photosynthesis & Cellular Respiration captures
energy from the Sun occurs in chloroplast reactants: 6CO 2 + 6H 2 O
+ light products: C 6 H 12 O 6 + 6O 2 releases energy from food
occurs in mitochondrion reactants: C 6 H 12 O 6 + 6O 2 products: 6
CO 2 + 6 H 2 O + 36 ATP PHOTOSYNTHESISCELLULAR RESPIRATION
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More Animations!
http://highered.mheducation.com/sites/0072507470/
student_view0/chapter25/animation__how_the_krebs
_cycle_works__quiz_2_.html
http://highered.mheducation.com/sites/0072507470/
student_view0/chapter25/animation__how_the_krebs
_cycle_works__quiz_2_.html
