[DingDong!]

Was there an error on the water potential one? How do you figure out the WP from only the molar concentration and the solute potential. I added all the solute potentials up, and then from the previous question one of the had a WP of 0, so I subbed the value for the in for the pressure potential and got something like -5700, obviously wrong lol. Also like an idiot for the mitosis one I wrote so they can make their job easy (WTF??!) like an idiot instead of for growth and repair. For the essay one it said not write anything about the inhibitors but I still put a paragraph in lol.

[29SJ]

I found it quite hard.. harder than all the past papers I've done- even the january exam was easier!! what did you guys put for the water potential question... what term is used to describe the cell?!!! i put plasmolyis but i think it was haemolysis!!!!! really hope the grade boundaries are low

[prettyreebzrock]

hey i put plasmolysed too.. hope its right??

[DingDong!]

(Original post by 29SJ)
I found it quite hard.. harder than all the past papers I've done- even the january exam was easier!! what did you guys put for the water potential question... what term is used to describe the cell?!!! i put plasmolyis but i think it was haemolysis!!!!! really hope the grade boundaries are low

You were right, heamolysis is in red blood cells


There was WAAY to much drawing involved in this damn paper.

[TheWhole7ruth]

(Original post by DingDong!)
Was there an error on the water potential one? How do you figure out the WP from only the molar concentration and the solute potential. I added all the solute potentials up, and then from the previous question one of the had a WP of 0, so I subbed the value for the in for the pressure potential and got something like -5700, obviously wrong lol. Also like an idiot for the mitosis one I wrote so they can make their job easy (WTF??!) like an idiot instead of for growth and repair. For the essay one it said not write anything about the inhibitors but I still put a paragraph in lol.

The first WP one was -1052 or something - it had to have the same WP as the solution when the bubble didn't move (isotonic), and that WP was 0.4M = -1052kPa. The pressure potential was +310, I think - just a case of:

WP of cell in equilibrium = solute potential given in question + pressure potential

Then sub in the values for solute potential and WP (which is just the WP of the solution at 0.3M, as it's in equilibrium) and rearrange.

Yeah, I basically said growth and repair for the ants, but I'm pretty sure it's actually production of gametes for the male ants - because they're already haploid before they divide. Thought it was a bit farfetched in the exam but a lot of people thought it was the answer, and it makes sense..

[29SJ]

(Original post by DingDong!)
You were right, heamolysis is in red blood cells


There was WAAY to much drawing involved in this damn paper.

yay!! I know it was a weird paper over all.. hated the water potential question sooo much..this sounds really stupid but for the first question was it a biosensor'?

[thewelshboyo]

(Original post by 29SJ)
yay!! I know it was a weird paper over all.. hated the water potential question sooo much..this sounds really stupid but for the first question was it a biosensor'?

Yeah, I thought it was quite a strange one compared to all the past papers.
I put biosensor for the first question and tissue for the second part.

[loopy786]

(Original post by TheWhole7ruth)
The first WP one was -1052 or something - it had to have the same WP as the solution when the bubble didn't move (isotonic), and that WP was 0.4M = -1052kPa. The pressure potential was +310, I think - just a case of:

WP of cell in equilibrium = solute potential given in question + pressure potential

Then sub in the values for solute potential and WP (which is just the WP of the solution at 0.3M, as it's in equilibrium) and rearrange.

Yeah, I basically said growth and repair for the ants, but I'm pretty sure it's actually production of gametes for the male ants - because they're already haploid before they divide. Thought it was a bit farfetched in the exam but a lot of people thought it was the answer, and it makes sense..

YAY I think I did something like that, gives me hope... I found the ant question annoying, and the water potential one frustrated me because it's the only topic I didn't revise too well.

I thought there was WAY too much drawing on this paper.

[loopy786]

(Original post by 5015)
I put endocytosis - I think either might get the mark as technically theyre the same phago is just more specific, pinocytosis would be wrong though

It was a toss-up between endo- and phagocytosis for me. I went for the former based purely on the fact that I thought phagocytosis might be too specific. Hope we're right!!!

[romalaification]

About the ant question: I thought that you shouldn't put growth because it said the adult ants come out of the pupae fully grown? Or was I getting the wrong end of the stick?

I also didn't get the water potential question at all... I guessed most of it

The rest of the paper seem to go quite well though (fingers crossed) - I found it much easier than any of the mocks we've done in class...

[loopy786]

(Original post by romalaification)
About the ant question: I thought that you shouldn't put growth because it said the adult ants come out of the pupae fully grown? Or was I getting the wrong end of the stick?

I also didn't get the water potential question at all... I guessed most of it

The rest of the paper seem to go quite well though (fingers crossed) - I found it much easier than any of the mocks we've done in class...

I wrote something about replacing old cells, I think, and something else. I can't really remember anymore. D: Trying to focus on Chemistry instead.

[thewelshboyo]

(Original post by romalaification)
About the ant question: I thought that you shouldn't put growth because it said the adult ants come out of the pupae fully grown? Or was I getting the wrong end of the stick?

I also didn't get the water potential question at all... I guessed most of it

The rest of the paper seem to go quite well though (fingers crossed) - I found it much easier than any of the mocks we've done in class...

But wouldn't they grow by process of mitosis in the pupae before they come out of it?

[romalaification]

Oh and if you're worrying about revising for BY2 - I used the AQA spec that I got online as a recap - not all of it is relevant and it's not exhaustive but what it does have is explained much better than the WJEC revision guide which doesn't seem to go into great depth...

[romalaification]

(Original post by thewelshboyo)
But wouldn't they grow by process of mitosis in the pupae before they come out of it?

Yes, but I thought it was referring to the importance of mitosis in adult females... then again the question never stated that so growth probably was the answer :/

[thewelshboyo]

(Original post by romalaification)
Yes, but I thought it was referring to the importance of mitosis in adult females... then again the question never stated that so growth probably was the answer :/

True... What did you put for the second part of the mitosis bit - the extra part about male ants?

[Luppy021]

Whats everyone predicting the essay question might be on for BY2?
I reckon its on either digestion/ comparing hydrophytes etc and maybe something on BY2.1

[Bob6795]

I made a stupid mistake on the ant cell drawing. I drew out 26 pairs of chromosomes for the diploid cell and 13 for the haploid, because i didnt read the question saying i only needed to draw 1. Do you think this would still get marks?

Also on the diagram after i just randomly drew about 10 chromosomes in each of the stages, i know i drew the stage accurately and correctly, but does the number of chromosomes matter?
Thanks

[charlotteshani]

what did everyone put for the extrinsic and intrisic glycoproteins?

[hello13]

(Original post by romalaification)
About the ant question: I thought that you shouldn't put growth because it said the adult ants come out of the pupae fully grown? Or was I getting the wrong end of the stick?

I also didn't get the water potential question at all... I guessed most of it

The rest of the paper seem to go quite well though (fingers crossed) - I found it much easier than any of the mocks we've done in class...

well for the first part of the ant question i wrote bout gentically identical daughter cells and that they are clones of the parent cell and then the second part for the i wrote about growth of an organism and repair of tissues but i think i got the wrong end of the stick on tht question
the water potential question was solid and confusing messed tht up but thought essay was good about rate of enzyme catalysed reaction

[hello13]

any ideas bout essay questions for by2??