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organism nutrition question

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organism nutrition question

Postby student » Mon Dec 06, 2004 4:32 am

if an organism does not photosynthesis how does it get its nutrients? glycolysis?
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Postby biostudent84 » Mon Dec 06, 2004 5:13 am

Photosynthesis is the process of turning sunlight into glucose. Glycosis is what (nearly) all organisms do to make energy. Well, to get nutriends, you can do what humans do, and eat food =D
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Postby Dr.Stein » Thu Jul 07, 2005 10:43 am

There are two kind of organisms: autotroph and heterotroph
- Autotroph organisms get their nutrients from processing inorganic materials into organic materials through photosynthesis (using photon for the energy of the process) or chemosynthesis (using chemical substances for the energy of the process).
- Heterotroph organism get their nutrients from consuming autotroph organisms, it means that they consume organic materials directly.
From trophic level view, it can be said that autotroph organisms are producers, whereas heterotroph organisms are consumers.

Glycolysis is a way to get energy (ATP or GTP). According to its name, the process lyses glucose to generate pyruvic acid + energy (under aerobic condition) or will generate lactic acid + a little energy or ethanol + little energy (depends on the organisms) (under anaerobic condition).
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Postby victor » Thu Jul 07, 2005 11:59 am

Um, I think that GTP is only produced in Krebs only...I saw the process in my book and there're only NADH and ATP that Glycolysis do...
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Postby Dr.Stein » Thu Jul 07, 2005 1:35 pm

The difference between ATP and GTP is only on the nitrogen base, it is adenine and guanine, respectively. It can be produced in glycolysis as well, not only in TCA (Krebs) cycle, though the most is produced in the latter.

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Postby victor » Thu Jul 07, 2005 1:45 pm

Hmm...I read in my book and it's stated that GTP is produced when Sucsynil CoA is transformed into Sucsinic Acid with Sucsinic Dehydrogenase...and it produces GTP which is used to form amino-acids..
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Postby MrMistery » Thu Jul 07, 2005 6:32 pm

GTP can easly be converted to ATP and vice-versa. Glycolysis produces only ATP from what i know, but bacteria convert it into GTP later for making proteins. Also all other organisms can do if necessary
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Postby victor » Fri Jul 08, 2005 8:16 am

Yup, I only heard ATP from Glycolysis...not GTP..
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Postby Dr.Stein » Fri Jul 08, 2005 1:26 pm

Well, mostly ATP, but in some special condition it produces GTP as well. I read it in my Cell Biology book.
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Postby MrMistery » Fri Jul 08, 2005 6:59 pm

What is that special condition?
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Postby victor » Sat Jul 09, 2005 11:21 am

Maybe in some occasion when our body very lack of amino-acids.. :lol:
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