Cellular Respiration
WARNING!
Pay attention!
There is a quick 6 point quiz at the end! 
Cellular Respiration
Objectives:
•Summarize how glucose is broken down in the first
stage of cellular respiration.
•Describe how ATP is made in the second stage of
cellular respiration.
•Identify the role of fermentation in the second
stage of cellular respiration.
•Evaluate the importance of oxygen in aerobic
respiration.
Cellular Respiration
• Takes place in ALL living organisms
– Plants
– Animals
– Some bacteria
Where as photosynthesis takes place only in
plants!!
Mitochondria
• Where glucose
is broken down
releasing CO2 ,
water, and ATP
ATP
• Most of the energy
from cell respiration
is converted into
ATP
• ATP is a substance
that powers most
cell activities.
Vocabulary
• Cellular Respiration – the transfer of energy
from an organic compound into ATP
• Fermentation – the breakdown of
carbohydrates by enzymes, bacteria, yeasts,
or mold in the absence of oxygen
• Aerobic- with oxygen
• Anaerobic – without oxygen
Cellular Respiration
Cellular Energy
The Stages of Cellular Respiration Cellular
respiration has two stages.
1- Glycolysis The first stage of cellular respiration
is called glycolysis.
2- Aerobic and Anaerobic Respiration The second
stage of cellular respiration is either aerobic respiration
(in the presence of oxygen) or anaerobic respiration (in
the absence of oxygen).
Cellular Respiration
Stage One: Breakdown of Glucose
•Glycolysis Glucose is
broken down to
pyruvate during
glycolysis, making
some ATP.
Let’s chant!
“Glycolysis breaks
down glucose!!!”
Cellular Respiration
Stage Two: Production of ATP
“with oxygen”
•Krebs Cycle - series of
reactions that produce ATP
during aerobic respiration.
•Electron Transport
Chain - large amounts of
ATP are made in an
electron transport chain.
Cellular Respiration
Fermentation in the “Absence of Oxygen”
•Fermentation When oxygen
is not present (anaerobic),
fermentation follows
glycolysis, regenerating
NAD+ needed for glycolysis
to continue.
•Lactic Acid Fermentation
In lactic acid fermentation,
pyruvate is converted to
lactate. – “Burns” in muscles
after working out
Cellular Respiration
• Cellular Respiration is a metabolic
process like burning fuel
– Releases much of the energy in food to
make ATP
– This ATP provides cells with the energy
they need to carry out the activities of life.
– C6H12O6 + 6O2  6CO2 + 6H2O + ATP
Post-it quiz
Grab a post-it and number 1 - 6
Review
• When oxygen is present most the ATP
made in cellular respiration is produced
by:
A. aerobic respiration
B. Glycolysis
C. alcoholic fermentation
D. Lactic acid fermentation.
Review
• Which of the following is NOT
responsible for creation of ATP in
cellular respiration?
A. Kreb’s cycle
B. glycolysis
C. Calvin Cycle
D. electron transport
Review
• When oxygen is absent, what type of
process will occur?
A. aerobic respiration
B. fermentation
C. electron transport
D. Kerb’s cycle
Review
• Which of the following is the correct
equation for cellular respiration?
A. C6H12O6 + O2 +
CO2  H2O + ATP
B. C6H12O6 + O2  CO2 + H2O + ATP
C. CO2 + H2O + Sunlight  C6H12O6 + O2
D. CO2 + H2O + ATP  C6H12O6 + O2
Review
• Where does aerobic respiration take
place in a cell?
A. chloroplast
B. stomata
C. mitochondria
D. cytosol
Review
• Why is fermentation important to cells?
A. used to make beer
B. regenerates energy molecules
C. Produces a LOT of ATP
D. used to make yogurt and bread