Photosynthesis

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rosebud
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Photosynthesis

Post by rosebud » Wed Sep 21, 2005 7:52 am

Can anyone tell me the products of respiration when oxygen is absent?

Thanks for ur help
8)

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victor
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Post by victor » Wed Sep 21, 2005 11:31 am

In respiration process, Oxygen is used as e- acceptor to form O2-. When the presence of Oxygen is none, it means anaerobic respiration where the acceptor of e- is not oxygen but other substances (e.g. sulphur, nitrogen) or other hydrocarbon chain (e.g. ethyl alcohol).

When Oxygen is replaced by those things above, so the waste product isn't all of them CO2 but other molecules get included also.

Hope this helps,
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VeenaandNivyah
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Post by VeenaandNivyah » Wed Sep 21, 2005 3:32 pm

anaerobic respiration is of two types: one in plants and the other in animal
cells at times.
in yeast cells, the end product is ethanol
at times, when v work out really hard then our muscle cells respire anaerobically to produce more energy to supplement the energy already being produced.in this case, lactic acid is produced as the end-product.

generally organisms respire aerobically as more energy [38 ATP ]
when compared to the 2 ATP produced during anaerobic respiration.

this is because during anaerobic respiration partial glycolysis or partial break-down of food to release energy takes place, whereas during aerobic, complete glycolysis takes place
in case u need equations,
food[glucose] :arrow: pyruvate :arrow: ethanol in plants
food[glucose] :arrow: pyruvate :arrow: lactic acid in muscle cells

hope u get what im trying to convey :lol:
in case u have doubts do ask my textbook is always there to answer :!:

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rosebud
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Post by rosebud » Thu Sep 22, 2005 10:29 am

thanks a lot

:P

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victor
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Post by victor » Thu Sep 22, 2005 11:23 am

VeenaandNivyah wrote:generally organisms respire aerobically as more energy [38 ATP ]
when compared to the 2 ATP produced during anaerobic respiration.


Only prokaryotic produces 38 ATP in aerobic respiration while eukaryotic cells produce 36 ATP..
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February Beetle
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Post by February Beetle » Thu Sep 29, 2005 4:33 am

I thought only 36-38 ATP can be produced in Eucaryotic cells because the last two stages, Krebs cycle and Electron Transport occurs in the mitochondria (liquid inner portion and the cristae) which are not in Prokaryotic cells. And, Electron Transport is where most of the ATP is made (up to 34 ATP per glucose molecule). As I understand it, the number of ATP can go up to 38 in Eucaryotic cells per glucose molecule depending on ... (something.)

Glycolysis always produces 2 (net) ATP
Krebs produces 2 ATP
Electron Transport produces up to 34 ATP (usually 32-34.)

I don't know much about how prokaryotic cells produce ATP but I do know Eucaryotic cells can produce 38.

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MrMistery
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Post by MrMistery » Thu Sep 29, 2005 7:54 pm

I agree with you. Even humans can do both respiration pathways
@february beetle(nice user, by the way)
Oxido-reduction also takes place at bacteria, in mesosoms. the reactions are similar, almost identical...
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