Download Chapter 9 Cellular Respiration: Harvesting Chemical Energy

Big Idea/Question….
• How is life as we know it powered?
• PS
• CR
Unit 4
Part 5 Cellular Respiration: Inputs, Outputs &
mitochondria
Learning Targets
5. Identify the inputs and outputs and
location of glycolysis, Krebs cycle, and
oxidative phosphorylation.
7. Compare and contrast the structure and
function of mitochondria and chloroplasts.
Cellular Respiration
Location?
Mitochondria
• Be able to identify:
– Inner membrane
– Outer membrane
– Cristae
– Matrix
Cellular Respiration
• What is it?
– Converts potential chemical (glucose) energy
into ATP
– 1 glucose can produce somewhere around 34
ATP molecules!!
• Who does it?
– Plants, animals and some bacteria
• How?.....
Cellular respiration
• The process:
• Reactants (inputs): Glucose & Oxygen
• Products (Outputs): CO2, H2O & ATP
Learning Check
• What are some similarities between
mitochondria and chloroplasts?
• Where does Cellular respiration occur?
• What are the inputs for CR?
• What are the outputs for CR?
Unit 4 Cell Energetics
Part 6 Glycolysis, Bridging Process, the
Krebs Cycle/Citric Acid Cycle & Oxidative
phosphorylation
Learning Targets
5. Identify the inputs and outputs and
location of glycolysis, Krebs cycle, and
oxidative phosphorylation.
Electron Carriers in CR
• NAD+  NADH
• FAD+  FADH2
Cellular Respiration
•
•
•
•
Glycolysis
Bridging Process
Krebs Cycle
Electron Transport Chain
Glycolysis
•
•
•
•
•
Glycolysis  splitting glucose
Location  cytoplasm
Anaerobic (no O2 required)
Utilized by ALL cells
Steps
– Energy Investment
– Energy Payoff
• Per Glucose
– Produces 2 ATP ( 5 % of
available energy)
– 2 NADH
– 2 Pyruvate
Glycolysis Animation
http://highered.mcgrawhill.com/sites/0072507470/student_view0/
chapter25/animation__how_glycolysis_wo
rks.html
Now what??
Bridging (Transition) Process
• Aerobic  requires O2 as final electron acceptor (happens in ETC)
• Location --inside mitochondria “One-Two Punch”
– Carbonyl group released as CO2
– NAD+ reduced to NADH
– Leaves Acetyl--picked up by CoA & becomes Acetyl CoA
• Surplus of ATP  acetyl-CoA gets stored as lipid
• Little ATP  acetyl-CoA enters Krebs cycle & makes ATP
Krebs Cycle
aka Citric Acid Cycle
• Location--Matrix of
mitochondria
• Aerobic  requires
O2 as final eacceptor
• Produces:
–
–
–
–
CO2 (from carbonyl)
NADH
FADH2
ATP
Electron Transport Chain
• Location--Membrane of cristae
• Aerobic  requires O2 (final electron acceptor)
• Follow the electrons—and protons!
•
Animation
–
vcell.ndsu.nodak.edu/animations/etc/first.htm
Oxidative Phosphorylation
• Electrons power proton pumps (which are
imbedded proteins)  pump H+ into
intermembrane space (ETC)
• Generates ATP when H+ diffuse back into
matrix thru ATP Synthase (Chemiosmosis)
• NAD+ powers 3 pumps  3 ATP
• FAD+ powers 2 pumps  2 ATP
•
http://www.nature.com/nrg/journal/v2/n5/animation/nrg0501_342a_swf_MEDIA1.html
Oxidative Phosphorylation
– e- transferred to oxygen through proton pumps
 builds up proton gradient
– Generates ATP through ATP Synthase
Learning Checks
• What are the 4 parts of Cellular Respiration, and where
are they located?
• Mitochondria transfer _____________ energy from
________ to ATP; chloroplasts transform
___________energy into the chemical energy.