Set me straight

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mikki
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Set me straight

Post by mikki » Wed Mar 29, 2006 5:43 am

Ok, I am really confused which one is correct?

glucose is oxidised to pyruvate regardeless if oxygen is present. If there is oxygen, it goes to the krebs cycle. If not the it is oxidised to lactate

Or

Oxygen has to be present for pyruvate to be oxidized. If there is no oxygen present then fermentation occurs. Lactic acid is a by-product of fermentation.

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Post by kiekyon » Wed Mar 29, 2006 6:19 am

i think both is correct

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Post by mikki » Wed Mar 29, 2006 7:55 am

:lol: Uhm, okay, no.

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Post by MrMistery » Wed Mar 29, 2006 6:18 pm

Actually only the first one is correct because pyruvate can be oxidised(to lactate, ethanol etc) even if there is no oxygen present.
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Poison
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Post by Poison » Wed Mar 29, 2006 8:50 pm

I think the both can be correct.
Because it say in the first one "glucose" can be oxydized... And in the second one it says "pyruvate" can be oxydized....
I may be thinking in my language. Correct me please.
Actually, I think it is more like an english grammer question rather than bio.
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Post by th1_rhs13 » Thu Mar 30, 2006 1:11 am

Agreed, Poison.

The latter has validity as well; lactic acid, Co2, C2H6O can be derived from broken down pryuvate in anarobic respiration.

PS: Ever get that gamete issue [ingestion] sorted out? Hahaha.

MrMistery wrote:Actually only the first one is correct because pyruvate can be oxidised(to lactate, ethanol etc) even if there is no oxygen present.

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MrMistery
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Post by MrMistery » Thu Mar 30, 2006 5:12 pm

NO!!!
Look at the first part of a second sentence
Oxygen has to be present for pyruvate to be oxidized.


What this is saying is that in the absence of O2 oxidation of pyruvate can not take place. That is false, for the already mentioned reasons(fermentation).

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Andrew
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Post by th1_rhs13 » Thu Mar 30, 2006 5:36 pm

I'm familiar with aerobic and anrobic respiration, but the the other two sentences in 'option b' are true too.

You need to calm down with those exclamation marks, dude.

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Post by MrMistery » Thu Mar 30, 2006 6:09 pm

Agreed, the others are true. But if an afirmation has 1000 sentences out of which only 999 are true is false, unless they have the "or" sign between them, which is not the case.

Regards,
Andrew
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Poison
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Post by Poison » Thu Mar 30, 2006 8:44 pm

"Oxygen has to be present for pyruvate to be oxidized. "
The problem is that we (at least I am) are thinking in our languages. What I understood from that sentence is: Oxygen is needed for pyruvate to carry on the reaction. I mean what you say should be the "glucose oxydation". I may be wrong. I'm not a native speaker.
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Post by th1_rhs13 » Thu Mar 30, 2006 9:33 pm

Well if your tact is based on symantics re-read my post; never did I claim to side with one or the other. I placed emphasis on 'option b' having apt statements not claiming it to be an absolute.

Edit: Cease PMing me about my age. Im here to articulate my limited, but growing, knowledge of Biology and seek the aid of others grasp of Biology. Nothing more.

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Post by MrMistery » Fri Mar 31, 2006 6:24 pm

@Poison
oxidation, in any languange, in the chemical language, doesn't mean "reacting with oxygen" it means "giving some electrons"
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