Transcript Aerobic Respiration - East Muskingum Schools

Bell Ringer
On your response board, write out
the chemical equation for
Cellular Respiration.
Be sure to use the formula for a simple
carbohydrate, not glucose.
Rewind: Did I fully understand what we
learned up to this point?
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What begins the process of cellular
respiration in ALL living things?
Glycolysis
___________
When cells do NOT have oxygen available
Fermentation
they enter what pathway? ___________
When cells DO HAVE oxygen available
Aerobic respiration
they enter what pathway?_____________
Caution:

We have discussed “focusing” before in
class…. It is to your advantage to take
your time on the next 19 slides and be
careful to “digest” or fully understand
what you are learning. Take a moment to
discuss with a lab partner to make sure
you both understand before moving on!
Aerobic Respiration
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(not "breathing" respiration, but rather how a cell uses
oxygen to break down glucose or food for energy)
Involves a cell using oxygen molecules to
break down food to release energy.
For Prokaryotes, takes place in cytosol
For Eukaryotes, takes place in
mitochondrial matrix, which contains
coenzyme A to catalyze the following
reactions:
Mitochondria
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Do you see the difference between inner mitochondria
membranes (called the cristae) and the fluid or matrix?
Label both of these on the mitochondria at the bottom
of the note sheet now!
The Kreb’s Cycle:
(Also Known as the Citric Acid Cycle)
A
series of biochemical reactions
that convert pyruvate into Carbon
dioxide and Water.
Step 1
 Pyruvate
releases a CO2 molecule
to form a two carbon compound.
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Circle pyruvate and the carbon dioxide being
released on the diagram at the bottom of the
note sheet now
Step 2
 An
enzyme attaches this 2 carbon
compound to a (4-C) compound
making a 6 carbon compound
called Citric Acid.
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Circle citric acid on the diagram now
Step 3
 This
6 carbon compound releases
another CO2. Each time this
happens, energy is released
forming an electron carrier NADH.
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Circle all 3 of the carbon dioxides being released
on the diagram now
Step 4
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The remaining 4 carbon compound is
converted to the 4 carbon compound
that began the cycle when 1 ATP is
formed along with FADH2 and NADH
(electron carriers which WILL BE USED in
a final phase of respiration.)
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Circle this 4 carbon compound that keeps the
Kreb’s cycle operating as a “cycle” on the
diagram now
Conclusion:
For each turn of the Kreb’s cycle 1
ATP, 3 NADH and 1 FADH2 are
formed.
2
 For every glucose molecule, ___
pyruvic acid molecules were formed
during glycolysis. So, for every
glucose molecule, the Kreb's cycle will
2
turn ______
times thus producing
2
______
ATP's.
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Review this on the diagram at the bottom of the page now!
Electron Transport
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The second stage of aerobic respiration where
most of the energy transfer from glucose to
ATP actually occurs.
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Takes place in the inner mitochondrial organelle
membranes
Electrons pass through a series of molecules called
the electron transport chain.
Summary Picture Page 213
Phase 1
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every time a Hydrogen atom is released,
high energy electrons enter a transport
chain in the mitochondrial membranes
similar to the transport chain in the
thylakoid membranes.
Circle moving
electrons in the
picture now.
Phase 2
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as these moving e- lose energy, a
concentration gradient of protons builds
up across the inner mitochondrial
membrane.
Circle the protons that
build up INSIDE the
mitochondria membrane
Phase 3
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this concentration gradient of protons
(H+) drives the synthesis of ATP by
chemiosmosis
(a phosphate is added to ADP to make
ATP)
Circle the ADP
becoming ATP now
Phase 4
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Where do these moving e- end up? As the
protons move into the mitochondrial
matrix, and the electrons move out of the
transport chain . . . they combine with
Oxygen (the final electron acceptor) to
form water: (that’s why we call this Aerobic respiration!)
O2 + 4 e- + 4 H+  2 H20
Energy Produced:
For every glucose molecule, glycolysis
produces 2 ATP. The Kreb's cycle
produces 2 ATP, and the electron
transport chain produces 34 ATP.
 That gives a total of ____ATP when
____________ is available to the cell
during aerobic respiration.
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• Summary Rewind: Did I fully understand what we just learned?
• Do you see the “biochemical pathway” that exists between the
two processes we have covered in chapter 9 in the diagram
below?
Summary Rewind: Did I fully understand what we just learned?
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You WILL have to write the following equation on the
next test:
C6H12O6 +6O2  6 CO2 + 6H2O + energy
The equation looks opposite the photosynthesis equation
but it is NOT an actual reversal since it occurs in
different places in the cell and through different
biochemical pathways.
Which pathways are more efficient at producing energy
from glucose: anaerobic or aerobic?
Homework:
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Return your laptop to the correct slot now
Complete the “Electron Transport in the
Mitochondria” coloring page & questions
now.