Question-cellular respiration

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biology_06er
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Question-cellular respiration

Post by biology_06er » Thu Jun 15, 2006 1:49 am

Hi there

I am unsure about this question..can someone please help

the net yeild from acetyl-CoA in one round of the krebs cycle includes all of the following, EXCEPT

One FADH2
One GTP
Three NADH
Two CO2
All

all of them are right (i think) as looking through my notes thats what i see..however the GTP phosphorylates ADP to give ATP so does that mean a GTP is still included?

and also during cellular respiration, a proton gradient in mitochondria will be generated by.........and used primarily for.....

i narrowed it down to..
1-the electron transport chain...ATP synthesis
2-diffusion of protons....ATP synthesis

I would go with the first one but could someone please tell me if i'm right

Thanks
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Post by victor » Thu Jun 15, 2006 6:53 am

Um, I can think also that the first question are all right.. :?
And for the 2nd question, yes, the first option is the right one.:lol:
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Post by biology_06er » Thu Jun 15, 2006 7:10 am

Hi

thanks for the reply...one other thing...it asks me to name the final electron acceptor in a plant and animal cell...what does this mean? is it just NADP+ and NAD+ respectively?

thanks
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Post by oppox » Thu Jun 15, 2006 8:25 am

I think thats the right answer if its about krebs cycle

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Post by biology_06er » Thu Jun 15, 2006 8:57 am

Hi

I'm not quite sure what they are talking about...the question is..

ATP synthesis in both plant and animal cells both involve the generation of an electrochemical gradient across a membrane
(chemiosmotic hypothesis) as shown in the schematic..

the picture is of a membrane with an ATP synthase with H+ ions being pumped and just before the H+ ions travel down the synthase an electron is released...so thats the electron transport chain so is the above answer still right?

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Post by victor » Thu Jun 15, 2006 9:07 am

the electron final acceptor is Oxygen. Because the gradient between + charge and - charge is high outside and inside the membrane, the H+ will go inside the cell membrane through ATP synthase and thus regenerating ATP there. When H+ gets in, electrons are also released to the final electron acceptor which is O2.
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Post by biology_06er » Thu Jun 15, 2006 10:49 am

Hi

Is this for both plant and animal cells though?

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Post by oppox » Thu Jun 15, 2006 11:13 am

Isnt it NADP+ in plants and oxygen in animal cells

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Post by victor » Thu Jun 15, 2006 12:15 pm

yes ! It happens to both cells. :lol:
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