krebs cycle & electron transport chapter 9-2
DESCRIPTION
See video 9A AEROBIC RESPIRATIONvideo 9ATRANSCRIPT
KREBS CYCLE &
ELECTRON TRANSPORTChapter 9-2
http://www.clickatutor.com/mitochondria.jpghttp://www.therunningdoctor.com/runinjuries.htm
REMEMBER:The “fork in the road” happens following glycolysis. The presence or absence of _______________decides which path it takes next.
• See video 9A AEROBIC RESPIRATION
FlowchartSection 9-2
Glucose(C6H1206)
+Oxygen
(02)
Glycolysis
Cellular Respiration
We will next focus on the Krebs Cycle. This is the path that is taken when oxygen is present.
Image from BIOLOGY Miller and Levine; Prentice Hall Publishing
_______________ follows glycolysis if oxygen is
present
• See video 9C See video 9D• KREBS CYCLE KREBS cont’d
REMEMBER:
Glycolysis happens inthe ________________outside the mitochondria.
Krebs cycle happens in_____________inside the mitochondria
_______________ (also called pyruvate)enters the _________________
Pyruvic acid joinswith _______________to form ________________
Diagram by Riedell
WHERE DO THESE GO?
Carbon dioxide is released into the ________________
High energy electron carriers move into the
____________________
(We will come back to this later)
Krebs Cycle Animation-(select #2)
Citric Acid Formation:
2 carbon ACETYL-COA combines with a 4 carbon molecule to form a 6-carbon molecule called _______________ .
WHERE DO THESE GO?
Coenzyme A goes back to pick up another ________________
Citric acid completes the ____________
KREBS CYCLE PRODUCES
____
____
____
____
KREBS CYCLE
Krebs Cycle Animation-(select #3)
WHERE DOES IT GO?
6 carbons in original glucose are lost as ________________ to atmosphere
→
WHERE DO THESE GO?
ATP can be used directlyto supply __________ for the cell.
High energy electron carriers move into the
____________________
FlowchartSection 9-2
Glucose(C6H1206)
+Oxygen
(02)
Glycolysis KrebsCycle
Cellular Respiration
We will next focus on the the Electron Transport Chain
WHERE DOES IT HAPPEN?
Enzymes for ELECTRON TRANSPORT CHAINare located in the ___________________________
• See video 9E See video 9F• ELECTRON TRANSPORT ET cont’d
ELECTRON TRANSPORT CHAIN
Image from: BIOLOGY by Miller and Levine; Prentice Hall Publishing©2006
INTERMEMBRANE SPACE
MATRIX
CRISTAE
Electron Transport Chain Animation-(select start, continue, and #1)
Electron Transport Chain:
High-energy _____________ from __________ and __________are passed along the electron transport chain.
Energy from passing electrons is used to transport _____________________ across the membrane.
The pumping of H+ ions into the _______________________ represents potential energy that is harnessed to make ATP.As H+ ions escape through ion channels back into the matrix, ________________ spins and adds a phosphate to ADP toform _______
Electron Transport Chain Animation-(select start, continue, and #3)
Electron Transport Chain:
Electron Transport Chain:
________________ serves as the final electron acceptor of the electron transport chain.
At the end of the electron transport chain, an enzyme combines the electrons with the hydrogen ions and oxygen to form ______________
High-energy electrons from ________ come inat beginning but electrons from _________come in farther down the chain.
Electron Transport Chain Animation-(#1 and #2)
SO:
NADH → _____FADH2 → _____
Glucose Glycolysis
Cytoplasm
Pyruvic acid
Electrons carried in NADH
Krebs Cycle
Electrons carried in
NADH and FADH2
Electron Transport
Chain
Mitochondrion
Figure 9–2 Cellular Respiration: An OverviewWHATS THE BIG PICTURE?
CELLULAR RESPIRATIONincludes:
______________________
______________________
_______________________
GLYCOLYSISHappens in ______________
Breaks down ____________into ________________
Produces
_______ __________
KREBS CYCLEhappens in ________________
Breaks down _________________
Produces: ____ ____
____ ____
ELECTRON TRANSPORT
Enzymes found in _____________
Uses high energy electrons and H+ ionsdonated by _______ and _______
Makes ___________
________ acts a final electron acceptor to produce ________
Image from BIOLOGY Miller and Levine; Prentice Hall Publishing
CELLULAR RESPIRATION(aerobic/ with oxygen):
1 glucose → _______________
FERMENTATION(anaerobic/ without oxygen):
1 glucose → ________________
CARBOHYDRATES SUPPLY ENERGY
Images from: http://www.miranda.com/library.en/Images/Pictures/girls-runners.jpg http://www.estrellamountain.edu/faculty/farabee/biobk/BioBookCHEM2.html
Cells burn GLUCOSE for their energy needs
Remember !
EXERCISE and ENERGY(Short term energy)
Cells normally contain _________amounts of ATP produced by_______________ &__________________________(only enough for a few seconds of activity)
Once this ATP is used up_____________ fermentation can provide enough ATPto last about ___________________.
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EXERCISE and ENERGY(Short term energy)
Once race is over, _______________must be broken down using oxygen.
Well __________ athletes burnlactic acid more efficiently.
Image from: http://www.miranda.com/library.en/Images/Pictures/girls-runners.jpg
EXERCISE and ENERGY(LONGER term energy)
For exercise longer than 90 seconds_____________________ is the onlyway to make enough ATP.
Cellular respiration releases energy_____________ than fermentation.
Well conditioned athletes must pace themselves during a long race.
Animal cells store GLUCOSE as_____________to use later.
Image from: http://www.msu.edu/course/lbs/145/smith/s02/graphics/campbell_5.6.gif
REMEMBER
What happens in a long race when the body’s glucose all is used up?
EXERCISE and ENERGY(LONGER term energy)
________________ store glucose as ________________ which can be broken down into glucose to supply energy for_______________of activity.
EXERCISE and ENERGY(LONGER term energy)
After glycogen stores are used up the body
begins to break down ________
That’s why aerobic exercise
must continue for longer than
20 minutes if you want tolose weight!
Image from: http://blackmovie.us/movie/Fat.Albert/fat.albert.movie.jpg
ALL CELLS NEED ENERGY
All __________________(including plant and animal cells) have _______________ for cellular respiration
All __________________ (bacteria)have their electron transport enzymes attached to their_____________________
Remember: No membrane bound organelles!