1. Chemical Pathways Chapter 9-1
CELLULAR RESPIRATION
Chemical Pathways
Chapter 9-1

2. In this chapter, we will learn how this glucose is ____________ by organisms and the _______
is stored
as _______
in a
process
called
___________________
broken down
energy
ATP
CELLULAR RESPIRATION
What kind of organisms do this?

3. CYTOPLASM Area with gel-like material inside cell membrane
Image from:
Area with gel-like material
inside cell membrane
surrounding mitochondria
= ______________________
Power plant of cell
that burns glucose
and stores the energy
as ATP
= _______________
CYTOPLASM
mitochondria

4. MITOCHONDRIA = cell power plant
Surrounded by ___________ membrane
Outer membrane & Inner membrane (called _______________ )
Space between inner membrane & outer membrane
= ____________________
Space inside cristae folds
= _________________
CYTOPLASM surrounds mitochondria
DOUBLE
CRISTAE
INTERMEMBRANE SPACE
MATRIX

5. All organisms (heterotrophs AND autotrophs) use the _____________ to
 Image from:
All organisms (heterotrophs AND autotrophs) use the _____________ to
charge up their _______
energy in food
ATP

6. PHOTOSYNTHESIS CELLULAR RESPIRATION 6 CO2 6 H2O C6H12O6 6O2 C6H12O6
___________ + _________ + ___________ →_______________ + __________
6 CO2
6 H2O
C6H12O6
6O2
CELLULAR RESPIRATION
C6H12O6
6 CO2
_____________ + _________ →________ + __________ + __________
______________________________________________________________
6O2
6 H2O
The two equations are exact opposites!

7. Remember from Photosynthesis?
High energy electron carrier = ___________
Cellular respiration uses some different carriers to transport high energy electrons.
_______ & ________
NADP+
NAD FAD
________ + _________ → ____________
2 e- + H+
NAD+
________ + _________ → ____________
FAD
2 e- + 2H+

8. The first step in cellular respiration = __________________
Glycolysis happens in
the ________________
outside the mitochondria
GLYCOLYSIS
CYTOPLASM
See glycolysis movie

9. Glycolysis (GLYKOS = ________ LYSIS= ___________ )
BUT it needs some ____________to get it started.
What molecule do you think is going to
supply the energy do this?
sweet
split apart
DOES NOT REQUIRE OXYGEN
ENERGY
ATP

10. ____________________ + _______________
GLYCOLYSIS
________ ↓
___________ → → _____________
____________________ + _______________
GLUCOSE
2 PYRUVIC ACID
ATP ATP ATP ATP
NADH NADH
4 ATP’s
2 ATP’s
PUT IN ________ and GET BACK __________
Net gain of ________ and __________
2 ATP’s NADH

11. PYRUVIC ACID MOVES TO NEXT STEP
IF THERE IS NO OXYGEN (______________)
IF THERE IS OXYGEN (_____________)
= ANAEROBIC
= AEROBIC

12. PYRUVIC ACID ___________ OXYGEN WITHOUT
2 kinds of fermentation
___________________ & _____________________
WITHOUT
ANAEROBIC
Alcoholic Lactic acid

13. ALCOHOLIC FERMENTATION
_______ +_____ →__________ + ______ + _____
PYRUVIC ACID
ALCOHOL
CO2
NAD+
Happens when yeast makes bread dough rise
CO2 bubbles make _____________ in bread
Alcohol _______________
during cooking
air spaces
evaporates

14. LACTIC ACID FERMENTATION
_______ +_____ →______________ + ________
PYRUVIC ACID
LACTIC ACID
NAD+
muscles
Happens in _____________ during ____________when body
can’t get oxygen to tissues
fast enough.
Lactic acid builds up in
muscles causing soreness
exercise

15. → → FERMENTATION HAPPENS so cells can ____________________
PYRUVIC ACID
_______ +_____ →__________ + ______ + _____
CO2
NAD+
ALCOHOL →
NAD+
LACTIC ACID
______ →
You get the NAD+ carriers back
FERMENTATION HAPPENS so cells can ____________________
needed to keep glycolysis going
REGENERATE the NAD+

16. REMEMBER: The “fork in the road” happens following glycolysis
REMEMBER: The “fork in the road” happens following glycolysis. The presence or absence of _______________ decides which path it takes next.
OXYGEN

17. Flowchart Cellular Respiration
Section 9-2
Cellular Respiration
Glucose (C6H1206) +
Oxygen (02)
Glycolysis
Krebs Cycle
We will next focus on the Krebs Cycle. This is the path that is taken when oxygen is present.

18. Image from BIOLOGY Miller and Levine; Prentice Hall Publishing
KREBS CYCLE
_______________ follows glycolysis if oxygen is present

19. outside the mitochondria. Krebs cycle happens in _____________
REMEMBER:
Glycolysis happens in
the ________________
outside the mitochondria.
Krebs cycle happens in
_____________
inside the mitochondria
CYTOPLASM
MATRIX

20. KREBS CYCLE
KREBS CYCLE PRODUCES
____ 3 1 1 4

21. WHERE DOES IT GO? →
6 carbons in original glucose are lost as ________________ to atmosphere
Carbon dioxide

22. WHERE DO THESE GO?
ATP can be used directly to supply __________ for the cell.
High energy electron carriers move into the
____________________
energy
ELECTRON TRANSPORT
CHAIN

23. Electron Transport Chain
Flowchart
Section 9-2
Cellular Respiration
Glucose (C6H1206) +
Oxygen (02)
Glycolysis
Krebs Cycle
Electron Transport Chain
We will next focus on the Electron Transport Chain.

24. WHERE DOES IT HAPPEN? ET Glycolysis
KREBS
Enzymes for ELECTRON TRANSPORT CHAIN
are located in the
___________________________
Inner mitochondrial membrane (cristae)

25. INTERMEMBRANE SPACE ELECTRON TRANSPORT CHAIN CRISTAE MATRIX
Image from: BIOLOGY by Miller and Levine; Prentice Hall Publishing©2006

26. Electron Transport Chain:
Electron Transport Chain Animation-(select start, continue, and #1)
High-energy _____________ from __________ and __________ are passed along the electron transport chain.
Energy from passing electrons is used to transport _____________________ across the membrane.
electrons
NADH FADH2
Hydrogen ions (H+)

27. Electron Transport Chain:
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 to
form _______
INTERMEMBRANE SPACE
ATP SYNTHASE
ATP

28. Electron Transport Chain:
OXYGEN
________________ 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 ______________
water (H2O)

29. SO:
NADH → _____
FADH2 → _____
3 ATP’s
2 ATP’s

30. WHATS THE BIG PICTURE? Pyruvic acid Glucose Glycolysis
Electrons carried in NADH
Electrons carried in NADH and FADH2
Pyruvic acid
Electron Transport Chain
Glucose
Glycolysis
Krebs Cycle
Cytoplasm
Mitochondrion

31. CELLULAR RESPIRATION includes:
______________________
_______________________
GLYCOLYSIS
KREBS CYCLE
ELECTRON TRANSPORT CHAIN

32. GLYCOLYSIS Happens in ______________ Breaks down ____________
into ________________
Produces
_______ __________
CYTOPLASM
outside mitochondria
1 glucose
2 pyruvic acid (pyruvate) 2 2

33. KREBS CYCLE happens in ________________ Breaks down _________________
Produces:
____ ____
____ ____
MATRIX
inside mitochondria
2 pyruvic acid 2 6 8 2

34. ELECTRON TRANSPORT Enzymes found in _____________
Uses high energy electrons and H+ ions
donated by _______ and _______
Makes ___________
________ acts a final
electron acceptor to produce ________
cristae
inner membrane of mitochondria
NADH FADH2
32 (net) ATP
OXYGEN
H2O

35. Image from BIOLOGY Miller and Levine; Prentice Hall Publishing

36. CELLULAR RESPIRATION
(aerobic/ with oxygen):
1 glucose → _______________
FERMENTATION (anaerobic/ without oxygen):
1 glucose → ________________
36 ATP
2 ATP