Chapter
9
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Cum.
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Appendix
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Art
Art
Unit 2: The Cell
Cellular Respiration: Harvesting Chemical Energy
Review
Living
organisms
require
to perform cellular work.
Energy
flows
into most ecosystems as
and leaves as
.
Cellular
is a
catabolic
pathway that consumes
and organic molecules and yields the energy molecule
by the transfer of
.
Electron transfer occurs through chemical reactions called
reactions.
Molecules such as NAD
+
and FAD act as electron
receptors
in this pathway.
In cellular respiration,
is oxidized and
is
reduced,
in a series of steps called the
transport
chain
(ETC) to form
.
Cellular
respiration
comprises three metabolic
stages:
glycolysis, citric acid cycle, and oxidative phosphorylation.
occurs in the
to produce two molecules of
from the
metabolism
of one
molecule.
The
is
converted
to
CoA, which enters the
acid cycle in the
matrix
of the
mitochondrion.
During
phosphorylation, NADH and FADH
2
donate
to the
ETC
to produce about 32 to 34
molecules
of
ATP.
Review:
Cellular Respiration
In
conditions, glycolysis is
followed
by
, which does not produce
, but
regenerates
NAD
+
, and allows glyocolysis to continue generating
.
Other organic molecules such as
and
can also enter cellular respiration via different
pathways.
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Feb 4, 2008
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