Cellular Respiration
If plants and some protists and
bacteria get their energy from
light…
… then where do we get
our energy from?
Yep, you guessed it!
FOOD!!!
But food only provides the raw
materials for cells in our bodies
to use.
What is the raw material food
provides?
We need another kind of energy to
make use of the food that our bodies
take in.
Can anyone think of where this
energy comes from?
Think back to photosynthesis, its
products, and how we might use them!
Our bodies use OXYGEN
When we inhale, our bodies take
in oxygen to our blood streams
Hemoglobin which are part of red blood cells
carry the oxygen to all parts of your body.
There, it meets with the raw
material from the food
you have eaten.
Remember what that is?
Food and oxygen come together in
a particular part of the cell and
then undergoes…
CELLULAR RESPIRATION!
If photosynthesis occurs in
chloroplasts…
Plant cell
Animal cell
Where do you think cellular
respiration take place?
Mitochondria
Inside the mitochondrial matrix
• Here, food and oxygen come together with
the help of enzymes
• Oxygen digests the food through several
complicated cell cycles (these are really
detailed processes that are very important but
too much for right now…come ask me later if
you want to know more about them)
• As food is digested, water and carbon
dioxide are released
So what have we got?
• We’ve eaten some food and gotten
glucose from it
• We’ve breathed in some oxygen
• We’ve digested the glucose using oxygen
• We’ve released water and carbon dioxide
So, can you figure out the formula
for cellular respiration??
(Hint: It has an interesting relationship to the formula for
photosynthesis)
Cellular Respiration Equation
C6H12O6 + 6O2  6CO2 + 6H2O + ATP
Glucose + Oxygen  Carbon Dioxide + Water + Energy
+

+
+
What TYPES of organisms do
cellular respiration?
Organisms that do CELLULAR
RESPIRATION:
•
•
•
•
•
•
Bacteria
Protists
Fungi
Plants
Animals
In short – almost ALL organisms undergo
cellular respiration (also known as
AEROBIC RESPIRATION)!
EXCEPT FOR…
• SOME bacteria, who undergo a similar
process called ANAEROBIC
RESPIRATION, which does NOT require
oxygen.
• Instead, this process may use nitrate,
sulfate, or carbonate…
• HOWEVER, it does not result in as much
ATP production as when oxygen is used
Let’s Review: Which process do each
of these formulas represent?
• light + 6CO2 + 6H20  C6H12O6 + 6O2
light + carbon dioxide +
water
 glucose (sugar) + oxygen
• C6H12O6 + 6O2  6CO2 + 6H2O + ATP
Glucose
+ Oxygen  Carbon Dioxide + Water + Energy
LOOK AT THE FORMULAS CAREFULLY. HOW
ARE THESE TWO PROCESSES RELATED?
• light + 6CO2 + 6H20  C6H12O6 + 6O2
light + carbon dioxide +
water
 glucose (sugar) + oxygen
• C6H12O6 + 6O2  6CO2 + 6H2O + ATP
Glucose
+ Oxygen  Carbon Dioxide + Water + Energy
What is the PURPOSE of each
process?
• light + 6CO2 + 6H20  C6H12O6 + 6O2
light + carbon dioxide +
water
 glucose (sugar) + oxygen
• C6H12O6 + 6O2  6CO2 + 6H2O + ATP
Glucose
+ Oxygen  Carbon Dioxide + Water + Energy
If PHOTOSYNTHESIS produces food
(glucose), then why is cellular respiration a
necessary NEXT STEP?
• light + 6CO2 + 6H20  C6H12O6 + 6O2
light + carbon dioxide +
water
 glucose (sugar) + oxygen
• C6H12O6 + 6O2  6CO2 + 6H2O + ATP
Glucose
+ Oxygen  Carbon Dioxide + Water + Energy
So…do ALL
PHOTOSYNTHETIC organisms
ALSO carry out CELLULAR
RESPIRATION?
So…do ALL organisms that
carry out cellular respiration
ALSO do photosynthesis?
What do we call organisms that
CANNOT carry out
photosynthesis, and must
therefore EAT FOOD to obtain
glucose?
(there are two words for this…)
QUICK REVIEW:
• WHY DO (non-photosynthesizing)
ORGANISMS NEED TO EAT?
• WHY DO ALL ORGANISMS NEED TO
BREATHE (or “take in” gases in the air)?
• WHAT TYPES of organisms undergo:
– Photosynthesis?
– Cellular respiration?
• WHY are photosynthesizing and nonphotosynthesizing organisms CODEPENDENT?
How can you relate CELLULAR
RESPIRATION to the “gummy
bear sacrifice” demonstration?
ARE YOU READY FOR
SOME COMPETITION?!?
Let’s think about some big ideas
here…
dry-erase boards out!!
In what organelle does the
process of photosynthesis take
place?
In what organelle does the
process of cellular respiration
take place?
What ingredients are needed to
fuel the process of
PHOTOSYNTHESIS?
Where do the ingredients needed
for PHOTOSYNTHESIS come
from?
(3 sources needed for full credit)
What ingredients are needed to
fuel the process of CELLULAR
RESPIRATION?
Where do the ingredients
needed for CELLULAR
RESPIRATION come from?
What is PRODUCED as a result
of PHOTOSYNTHESIS?
What is PRODUCED as a result
of CELLULAR RESPIRATION?
Organisms that carry out
PHOTOSYNTHESIS are also
known as WHAT?
(Add 1 bonus point if you can
identify two different terms for
this)
Organisms that DO NOT carry
out photosynthesis are known
as what?
(Add 1 bonus point if you can
identify two different terms for
this)
What TYPES of organisms can
do PHOTOSYNTHESIS?
What types of organisms can do
CELLULAR RESPIRATION?
WHY DO ALL ORGANISMS
NEED TO BREATHE (or take in
gases from the air in some
way)?
What is the name of the
pigment that is required for
photosynthesis because it
absorbs light?
The chlorophyll present in
MOST photosynthetic
organisms reflects wavelengths
that correspond to which
color?
Why do leaves change color in
the fall?
WHY do photosynthetic and
non-photosynthetic organisms
depend directly on one another?
BONUS (2 POINTS):
In what part of the chloroplast
do the “Light Independent”
reactions of photosynthesis take
place?