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CELLULAR RESPIRATION Notes
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Who:
Where:
NOTES
Plants and animals
Shannon uses the Figure on Pg. 125 as a great summary
of the processes.
There are four processes:
1st Step: Glycolysis in the
cytoplasm. No oxygen.
2nd Step: Transition State in
the Inner Membrane Space
2nd Step: Kreb’s Cycle (Citric
Acid) in the Matrix
3rd Step: ETC (Electron
Transport Chain) on the
membranes of the cristae
Why:
Pretty straight forward.
How:
General Overview
What to focus on:
*Names (Glucose, pyruvate,
acetyl CoA)
*A LITTLE ATP made in the
early processes.
*NADH & FADH2: made in early
steps to be used in the ETC
to generate ATP
*Highest yield of ATP comes
at the Electron Transport
Chain
*Number of ATP molecules
CELLULAR RESPIRATION Notes
How:
Part 1:
__Glycolysis:
Takes place in
the cytoplasm
because the
molecule is too
large to enter
the mitochondria
*A process to break down glucose so it fits through the
CM of the mitochondria.
*A 10 step process that initially uses ATP and then
makes a little ATP.
*Initial split produces PGAL(2 3-C molecules) which
then is rearranged to form pyruvic acid
How:
Parts 2/3:
Transition: in
inner matrix
space Citric Acid
Cycle/Kreb’s
Cycle: in the
Matrix
How:
Part 4:
Electron
Transport Chain:
on the membrane
of the cristae
1. Pyruvate too large to pass inner membrane so it
needs to be broken down again.
*Rip off one of the carbons (that’s the source of the
CO2 in the equation), now known as an acetyl group, and
escorted into the matrix by CoA, hence acetyl CoA
*Kreb’s Cycle: similar to the Calvin Cycle. Breaks
off the remaining two carbons (as CO2), cycles like CC
and makes some NADH and FADH2
*Acts just like the ETC in photosynthesis, except it is
not triggered to work by light.
*NADH drops off electrons and H’s at the first protein.
Play hot potato with the electrons.
*Oxygen is at the end of the chain “calling” for the
electrons.
*As each electron moves along the chain, the Hydrogens
CELLULAR RESPIRATION Notes
are pumped across the membrane.
*At the end of the chain, the hydrogen’s want to come
back in because of the concentration gradient, so they
enter through a protein channel known as ATP Synthase.
As they do this ATP can be made: 3 ATP’s/NADH and 1
ATP/FADH2
http://www.qcc.cuny.edu/biologicalsciences/Faculty/DMeyer/respiration.html