WJEC BY4 | 13th June 2014

C and D for the chloroplast?
And 6, 5, then 4 carbon? What were your reasons?

And in the mitochondrion disorder part, what did you say for 'what does it mean if less oxygen is consumed with pyruvate than ..' whatever the other one was?
and for the 2 questions below that lol

I got C and D too! That electron micrograph was shockingly unclear though..
And I got 6, 5, 4. Said that oxaloacetate (4C) combined with the acetate of acetyl CoA (2C), therefore citrate had 6 carbons and lost a carbon at each decarboxylation.

Made up most of the end of the Krebs question..

For the last couple I was unsure I said that there was no co enzyme a for pyrubvate and for the alpha thing it didn't need it
I said there was no oxygen present for the kreb intermediate stacking up so etc can't occur
I talked bout anaerobic resp for the very last question

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For the last couple I was unsure I said that there was no co enzyme a for pyrubvate and for the alpha thing it didn't need it
I said there was no oxygen present for the kreb intermediate stacking up so etc can't occur
I talked bout anaerobic resp for the very last question

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Was c pointing at that big shaded lump of what I thought was a stack of chloroplasts?

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Think question 1 was:
Ammonium
Azotobacter
Root nodules
Plant gets ammonium for protein synthesis, bacteria gets sugars to respire (??)
Circular ring of DNA outside of the nucleus.

The whole thing was a chloroplast, I think C was pointing at a stack of thylakoids.

Bacteria don't have a nucleus..?


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Bacteria don't have a nucleus..?


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Yes, no and yes lol

That's the 4th exam so far where I got A*/A on nearly all the past papers and came out of the real exam with huge doubts :/ worst part is most people thought it was a nice paper.

1st question is it ammonia or ammonium? I always had confusion with which one they wanted.

How to treat cerebral palsy - gene therapy? Seems more BY5 to me but it's all I could think of.

Nerve net - I drew lots of interlinked branches with gaps in and labelled the gaps as synapses.

Just how big are they on examples for the populations essay? As in did they want a specific type of bacteria, specific enzymes to synthesise in the lag phase etc. ?

Finally, would you say the product of the calvin cycle is Sucrose or Glucose? (both for the Rhizobium symbiosis question and the question about the calvin cycle). Or even something else?

Thanks.

That's the 4th exam so far where I got A*/A on nearly all the past papers and came out of the real exam with huge doubts :/ worst part is most people thought it was a nice paper.

1st question is it ammonia or ammonium? I always had confusion with which one they wanted.

How to treat cerebral palsy - gene therapy? Seems more BY5 to me but it's all I could think of.

Nerve net - I drew lots of interlinked branches with gaps in and labelled the gaps as synapses.

Just how big are they on examples for the populations essay? As in did they want a specific type of bacteria, specific enzymes to synthesise in the lag phase etc. ?

Finally, would you say the product of the calvin cycle is Sucrose or Glucose? (both for the Rhizobium symbiosis question and the question about the calvin cycle). Or even something else?

Thanks.

I think it's ammonium ions for the first question and then I put excitatory drugs to treat cerebral palsy? Just though would increase action potentials but I may be wrong!