1. CELLULAR RESPIRATION Review

2. All of them; all living things need to make ATP for energy
Animals green plants Fungi humans bacteria
In which of these organisms would you expect to find cellular respiration happening?
All of them; all living things need to
make ATP for energy

3. Name the organelle where glucose is
Which 2 carriers for high energy electrons are used during cellular respiration?
NADH and FADH2
Name the organelle where glucose is
burned and the energy is stored as ATP
mitochondria

4. O2 Which molecule acts as the last electron acceptor to make water?
OXYGEN

5. 3 How many carbons are in a Pyruvic acid molecule?
Give the overall equation for cellular respiration
6 O2 + C6H12O6 → 6 CO H2O + ATP

6. Compare the equation for PHOTOSYNTHESIS
below with the equation for CELLULAR RESPIRATION
6 CO H2O + ENERGY → 6 O2 + C6H12O6
6 O2 + C6H12O6 → 6 CO H2O + ENERGY
Cellular respiration is the reverse of photosynthesis

7. What happens to the Coenzyme A
after dropping off its 2 carbons?
Recycles back and picks up 2 more
carbons from pyruvic acid

8. The Krebs cycle is also called the _______________ cycle.
How many ATP’s are produced
from each molecule of glucose that
completes cellular respiration all the way through the Electron transport chain?
36-38 ATP’s are produced
The Krebs cycle is also called the
_______________ cycle.
Citric acid

9. Which pathway generates the most energy from glucose?
FERMENTATION CELLULAR RESPIRATION
Cellular respiration
Which stage of respiration generates
the most ATP?
ELECTRON TRANSPORT
Glycolysis = 2 ATP(net)
Krebs cycle = 2 ATP Electron transport chain = 32 ATP (net)

10. inner membrane (cristae)
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Identify the part:
A = ______________
B = ______________
C = ______________
D = ________________
E = ________________ E
Outer membrane
Intermembrane space
inner membrane (cristae)
matrix
cytoplasm

11. After glycolysis, which pathway will
pyruvic acid follow if oxygen is present?
It will enter the Krebs cycle

12. glycolysis Krebs cycle Identify the 3 stages of cellular respiration:
#1 = _____________
#2 = _____________
#3 = _____________
glycolysis
Krebs cycle
Electron transport chain
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13. False; both plants and animals have mitochondria
True or False
Only animal cells have mitochondria
False; both plants and animals have
mitochondria
How many carbons are in a glucose
Molecule?
6; C6H12O6

14. Cellular respiration begins with a process called ______________
glycolysis

15. Presence or absence of oxygen
After glycolysis, what determines which pathway pyruvic acid will follow?
Presence or absence of oxygen
Name the two kinds of fermentation
Lactic acid and alcoholic

16. False; only a net of 2 ATP and 2 NADH
True or False
Glycolysis releases a great deal of energy.
False; only a net of 2 ATP and 2 NADH
The 3 carbon molecule produced during
glycolysis is ________________
Pyruvic acid

17. Where does glycolysis take place?
In the cytoplasm outside the mitochondria

18. How many ATP’s must be added to get glycolysis started?
Why can glycolysis supply energy
to cells when oxygen is not available?
Glycolysis does NOT require oxygen

19. How many ATP’s are produced during glycolysis?
4 ATP’s are produced, but it took
2 ATP’s to get started so …
net of 2 ATP’s
What problem does a cell have when it
generates large amounts of ATP using
only glycolysis?
Once all the available NAD+ carriers are filled up & glycolysis will stop

20. Name the 3 pathways that make up cellular respiration in order.
Which molecule is regenerated during fermentation that allows cells to continue to make ATP using glycolysis when oxygen is low?
NAD+
Name the 3 pathways that make up
cellular respiration in order.
Glycolysis
Krebs cycle
Electron transport chain

21. D B E C Tell its location: Where Krebs cycle happens = ___
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Tell its location:
Where Krebs cycle happens = ___
Where is the Electron Transport Chain found = ___
H+ ions accumulate here
during electron transport = ___
Place where glycolysis
happens= ___ D C B E

22. Lactic acid fermentation
Type of fermentation used to make yogurt, cheese, saurkraut, kimchi, buttermilk, etc.
Lactic acid fermentation
The energy produced by electrons
passing down the Electron Transport
chain are used to move which ion into the intermembrane space?
H+ ions are pumped from the matrix and accumulate in the intermembrane space

23. Krebs cycle & Electron transport chain
Which parts of cellular respiration require oxygen?
Krebs cycle & Electron transport chain

24. Which kind of fermentation puts the air holes in bread?
Alcoholic fermentation releases
CO2 bubbles which pop and leave
holes in the bread
What is the final electron acceptor
at the end of the Electron Transport
Chain?
oxygen

25. Alcohol evaporates during cooking
If alcoholic fermentation is what makes bread rise, why don’t we get intoxicated from eating the bread?
Alcohol evaporates during cooking
During short term exercise cells are using which pathway to provide energy?
Lactic acid fermentation cellular respiration
lactic acid fermentation

26. produced when pyruvic acid is broken down?
What happens to the CO2
produced when pyruvic acid is
broken down?
It is released into the atmosphere
What is the energy tally from
1 molecule of pyruvic acid during the
Krebs cycle?
3 NADH, 1FADH2 , and 1 ATP

27. A H+ Where is the intermembrane space in this diagram?
Which ion is moving across the
membrane at the purple arrows? A H+

28. Where will the pyruvic acid go next if oxygen is present?
Where will the NADH
produced in this
reaction go next
if oxygen is
present?
Where will the pyruvic acid go next if oxygen is present?
To electron transport chain
Into mitochondria and Krebs cycle

29. The movement of which ion across the inner mitochondrial membrane
causes ATP synthase to spin and make
ATP? H+

30. Where does
the CO2
produced
here go next?
released to
the atmosphere

31. Reactions that happen without oxygen are called _____________________
anerobic

32. Where does the Krebs cycle take place?
Mitochondrial Matrix
Where is the Electron Transport Chain located?
Inner mitochondrial membrane
(cristae)

33. Name the
4 products
of the Krebs cycle
CO2, NADH, FADH2, ATP

34. Which enzyme helper molecule
reacts with pyruvic acid to
for Acetyl-CoA?
Coenzyme A OR CoA

35. What happens to pyruvic acid during the Krebs cycle?
It is broken down into carbon dioxide
in a series of steps
Because fermentation does NOT
require oxygen it is said to be
__________________
anaerobic

36. Where does the ATP produced here go? to the Electron transport chain
the FADH2
produced
here go next?
Where does the ATP produced
here go?
to the Electron
transport chain
Used by cell for
cellular activities

37. What happens to the NADH and FADH2
Because the Krebs cycle and
Electron Transport Chain REQUIRE
oxygen, they are said to be
_____________________
aerobic
What happens to the NADH and FADH2
produced during cellular respiration?
Their electrons enter the Electron Transport Chain

38. H+ Which ion is being pumped across the membrane at the purple arrows
during electron transport ?

39. Where does the Electron Transport Chain get the high energy electrons that are passed down the chain?
From NADH and FADH2

40. Name the reactants of cellular respiration
O2 and glucose (C6H12O6)
Name the products formed during cellular respiration
H20, carbon dioxide, energy (ATP)

41. Name the 4 products released during the Krebs cycle
Name this reaction
CO2, NADH, FADH2, ATP
glycolysis

42. Name the stage of cellular respiration that follows glycolysis
Krebs cycle

43. Where will the pyruvic acid go next if oxygen is NOT present?
Where does this
Reaction happen?
Where will the pyruvic acid go next if oxygen is NOT present?
In the cytoplasm
Stays in cytoplasm and does fermentation

44. Where is the matrix in this diagram?
The red molecule is the diagram is
__________________ B
ATP synthase

45. Another name for the inner membrane
in a mitochondrion is the ________.
What happens to the
CO2 produced in this
reaction?
cristae
Released into
atmosphere when we exhale
DIAGRAM BY RIEDELL

46. Name the pathway Electron transport glycolysis Electron transport
H+ ions and oxygen form water ________________
Lactic acid is formed in muscles ______________________
A glucose molecule is broken down
into 2 pyruvic acid molecules _______________________
H+ ions build up in the
intermembrane space _________________________
Citric acid is broken down
in a series of steps into CO2 _____________________
Electron transport
Lactic acid fermentation
glycolysis
Electron transport
Krebs cycle

47. Name the pathway Alcoholic fermentation Electron transport
Alcohol and CO2 are produced from pyruvic acid ______ ________________
Acetyl Co-A joins a 4 carbon
molecule to make citric acid ______________________
H+ ions pass from the intermembrane
space into the matrix to make ATP___________________
Oxygen acts as the last
electron acceptor and makes water____________________
Alcoholic fermentation
Krebs cycle
Electron transport
Electron transport

48. Where will the pyruvic acid go next if oxygen is present?
Where will the NADH
produced in this
reaction go next
if oxygen is
present?
Where will the pyruvic acid go next if oxygen is present?
To electron transport chain
Into mitochondria and Krebs cycle

49. Where will the pyruvic acid go next if oxygen is NOT present?
Where does this
reaction happen?
Where will the pyruvic acid go next if oxygen is NOT present?
In the cytoplasm
Stays in cytoplasm and does fermentation

50. Released into atmosphere when we exhale What happens to the
CO2 produced in this
reaction?
Released into
atmosphere when
we exhale