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Nessie133
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#461
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#461
(Original post by MLogan)
Can someone tell me were precisely each of these occur?
-oxidation phosphorylation
-substrate phosphorylation
-photo-phosphorylation

Thanks
substrate-level - glycolysis and Krebs cycle
oxidative- electron transport chain
photophosphorylation- light-dependent reaction of photosynthesis
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#462
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#462
(Original post by MLogan)
Can someone tell me were precisely each of these occur?
-oxidation phosphorylation
-substrate phosphorylation
-photo-phosphorylation

Thanks
oxidative phoshorylation occurs in the electron transfer chain (the final step of photosynthsis)

substrate level phosphorylation happens in glycolysis/ Krebs cycle

photophosphorylation happens during the light dependent reaction (in the grana/thylakoids)
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MLogan
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#463
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(Original post by Nessie133)
substrate-level - glycolysis and Krebs cycle
oxidative- electron transport chain
photophosphorylation- light-dependent reaction of photosynthesis
(Original post by frogs r everywhere)
oxidative phoshorylation occurs in the Krebs cycle/ electron transfer chain (the final step of photosynthsis)

substrate level phosphorylation happens in glycolysis

photophosphorylation happens during the light dependent reaction (in the grana/thylakoids)
Thanks guys
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#464
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#464
The net amount of ATP in glycolysis is two (two used up, four produced)
Do we need to know the total amount of ATP produce in Krebs/electron transfer chain?
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MLogan
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(Original post by frogs r everywhere)
The net amount of ATP in glycolysis is two (two used up, four produced)
Do we need to know the total amount of ATP produce in Krebs/electron transfer chain?
Maybe,i've seen in an old spec paper where they asked work out the total amount of ATP produced.
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Scienceisgood
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#466
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I forget, is p or q recessive or dominant?
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TheFootyKing19
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#467
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(Original post by Scienceisgood)
I forget, is p or q recessive or dominant?
P = Dominant
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MLogan
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#468
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(Original post by Scienceisgood)
I forget, is p or q recessive or dominant?
and Q is recessive
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(Original post by TheFootyKing19)
P = Dominant

(Original post by MLogan)
and Q is recessive
It doesn't really matter what letter you use. Does it? It could well be X for recessive and H for dominant.
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jonnyb123
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I've been wondering about this question, I understand all the marking points in the mark scheme, but they make no reference to the fact that CO2 concentration is actually higher in the morning when it's light than at night. Why is this?
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MLogan
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(Original post by frogs r everywhere)
It doesn't really matter what letter you use. Does it? It could well be X for recessive and H for dominant.
I just go by p=dominant and q=recessive, but i guess what you say is right as well!
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Scienceisgood
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(Original post by jonnyb123)
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I've been wondering about this question, I understand all the marking points in the mark scheme, but they make no reference to the fact that CO2 concentration is actually higher in the morning when it's light than at night. Why is this?
Plants have been respiring over night meaning CO2 levels are higher in the morning because not much photosynthesis has gone on in the morning meaning CO2 levels haven't had time to drop.

Understand?
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jonnyb123
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(Original post by Scienceisgood)
Plants have been respiring over night meaning CO2 levels are higher in the morning because not much photosynthesis has gone on in the morning meaning CO2 levels haven't had time to drop.

Understand?
Ah right so at 22:00 plants have only been respiring (and not photosynthesising) for a few hours whereas at 6:00 they have been respiring (and not photosynthesising) all night and only just started to photosynthesis again, so the CO2 levels are higher in the morning?
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Scienceisgood
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(Original post by jonnyb123)
Ah right so at 22:00 plants have only been respiring (and not photosynthesising) for a few hours whereas at 6:00 they have been respiring (and not photosynthesising) all night and only just started to photosynthesis again, so the CO2 levels are higher in the morning?
Yep. Don't forget, plants also respire.
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(Original post by jonnyb123)
Ah right so at 22:00 plants have only been respiring (and not photosynthesising) for a few hours whereas at 6:00 they have been respiring (and not photosynthesising) all night and only just started to photosynthesis again, so the CO2 levels are higher in the morning?
When I did the paper, I also though about it. Yes, that makes sense.
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(Original post by Scienceisgood)
Yep. Don't forget, plants also respire.
You're right. I just want to emphasise:

Plants respire ALL THE TIME (not just at night)
Watch when this comes up tomorrow!
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TheFootyKing19
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#477
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#477
Can someone kindly give me a 5 mark example answer about:

Managing succession in terms of conservation

Thank you!!
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lifeisgood2012
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#478
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#478
Could somone explain the whole process of respiration please as if we were asked 3 5 mark questions on respiration
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nathaan5
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(Original post by Nessie133)
substrate-level - glycolysis and Krebs cycle
oxidative- electron transport chain
photophosphorylation- light-dependent reaction of photosynthesis
is that basically all we need to know about them? the spec doesn't say anything else!
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master y
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(Original post by jonnyb123)
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I've been wondering about this question, I understand all the marking points in the mark scheme, but they make no reference to the fact that CO2 concentration is actually higher in the morning when it's light than at night. Why is this?
What would your model answer for this question be?
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