33904145
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Mapa Mental por dumb himbo, actualizado hace más de 1 año
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Creado por dumb himbo
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CH 7: How Cells Harvest Energy
- organisms classified on
how they gain energy
- HETEROTROPHS
- live on organic
compounds made
by other organisms
- live on organic
compounds made
by other organisms
- AUTOTROPHS
- produce their own
organic molecules
through photosynthesis
- produce their own
organic molecules
through photosynthesis
- "troph" means to feed
- "hetero" means different
- "hetero" means different
- HETEROTROPHS
- RESPIRATION
- all organisms use some
form of cellular respiration
to extract energy from
organic molecules
- all organisms use some
form of cellular respiration
to extract energy from
organic molecules
- METABOLIC PROCESSES
- AEROBIC RESPIRATION
- final electron receptor
is oxygen (O2)
- energy released in
steps not all at once
- final electron receptor
is oxygen (O2)
- ANAEROBIC RESPIRATION
- final electron acceptor
is an inorganic
molecule (not O2)
- final electron acceptor
is an inorganic
molecule (not O2)
- FERMENTATION
- final electron
acceptor is an
organic molecule
- final electron
acceptor is an
organic molecule
- AEROBIC RESPIRATION
- ELECTRON CARRIERS
- OXIDATION OF GLUCOSE
- oxidation of glucose happens in stages:
- GLYCOLYSIS
- converts 1 glucose (6 carbons)
into to 2 pyruvate (3 carbons)
- net production of 2 ATP molecules
bu substrate-level phosphorylation
- 2 NADH produced by
reduction of NAD+
- NADH must be recycled
- NADH must be recycled
- 2 NADH produced by
reduction of NAD+
- net production of 2 ATP molecules
bu substrate-level phosphorylation
- occurs in cytoplasm
- converts 1 glucose (6 carbons)
into to 2 pyruvate (3 carbons)
- PYRUVATE OXIDATION (PREP STEP)
- in the presence of oxygen,
pyruvate is oxidized
- EUKARYOTES
- occurs in
mitochondria
- multienzyme complex called
pyruvate dehydrogenase
catalyzes reaction
- for each 3-carbon pyruvate molecule:
- 1 carbon dioxide (CO2)
- decarboxylation
by pyruvate
dehyrdogenase
- decarboxylation
by pyruvate
dehyrdogenase
- 1 NADH
- 1 acetyl-CoA
- consists of 2
carbons from
pyruvate attached
to coenzyme A
- consists of 2
carbons from
pyruvate attached
to coenzyme A
- 1 carbon dioxide (CO2)
- for each 3-carbon pyruvate molecule:
- multienzyme complex called
pyruvate dehydrogenase
catalyzes reaction
- occurs in
mitochondria
- PROKARYOTES
- occurs in plasma
membrane
- occurs in plasma
membrane
- EUKARYOTES
- in the presence of oxygen,
pyruvate is oxidized
- KREBS CYCLE
- oxidizes acetyl group
from pyruvate
- biochemical pathway of
9 steps in 3 segments
- acetyl-CoA +
oxaloacetate --> citrate
- citrate rearrangement
and decarboxylation
- for each acetyl-CoA that enters:
- regeneration of
oxaloacetate
- release 2 molecules of CO2
- reduce 3 NAD+ to 3 NADH
- reduce 1 FAD (electron carrier) to FADH2
- produce 1 ATP
- regeneration of
oxaloacetate
- for each acetyl-CoA that enters:
- citrate rearrangement
and decarboxylation
- acetyl-CoA +
oxaloacetate --> citrate
- biochemical pathway of
9 steps in 3 segments
- occurs in matrix
of mitochondria
- oxidizes acetyl group
from pyruvate
- ELECTRON TRANSPORT CHAIN & CEMIOSMOSIS
- GLYCOLYSIS
- oxidation of glucose happens in stages:
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