OCR Biology F211 resit - 16th May Watch

Ivo
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#261
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#261
(Original post by Groat)
Most likely, yes.
Ah sweet, thanks. I was kinda worried as they said liver is an eg of an organ, so I thought that to get 2nd mark you had to put this in context.
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Shabba101
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Do you think i'll get the marks for what i wrote on the last question about translocation?

I wrote something along the lines of: Assimilates like sucrose are actively loaded into the sieve tube via active transport. This decreaes water potential so water moves into the sieve tubes via osmosis. Increases hydrostatic pressure. Meanwhile at the sink sucrose is used by the phloem. this increases water potential so water leaves the sink end creating low hydrostatic pressure. This creates a pressure gradient in which assimilates move from source to sink end.

Ya' think i'll pick up a few for that? :/
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Straight up G
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(Original post by Groat)
Most likely, yes.
Disagree, I think they like the word 'particular ' or 'specialised'.
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Ivo
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(Original post by Shabba101)
Do you think i'll get the marks for what i wrote on the last question about translocation?

I wrote something along the lines of: Assimilates like sucrose are actively loaded into the sieve tube via active transport. This decreaes water potential so water moves into the sieve tubes via osmosis. Increases hydrostatic pressure. Meanwhile at the sink sucrose is used by the phloem. this increases water potential so water leaves the sink end creating low hydrostatic pressure. This creates a pressure gradient in which assimilates move from source to sink end.

Ya' think i'll pick up a few for that? :/
I would say 2 maybe more. The qu. did say how substances load into phloem, not the whole process.
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Straight up G
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(Original post by Shabba101)
Do you think i'll get the marks for what i wrote on the last question about translocation?

I wrote something along the lines of: Assimilates like sucrose are actively loaded into the sieve tube via active transport. This decreaes water potential so water moves into the sieve tubes via osmosis. Increases hydrostatic pressure. Meanwhile at the sink sucrose is used by the phloem. this increases water potential so water leaves the sink end creating low hydrostatic pressure. This creates a pressure gradient in which assimilates move from source to sink end.

Ya' think i'll pick up a few for that? :/
Doubt it unfortunately. The question was about assimilates being loaded into the phloem not translocation. One mark for the first sentence, maybe.
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Groat
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(Original post by Ivo)
Ah sweet, thanks. I was kinda worried as they said liver is an eg of an organ, so I thought that to get 2nd mark you had to put this in context.
I remember there being a question about why the lungs were considered an organ. However it simply said define an organ!

(Original post by Straight up G)
Disagree, I think they like the word 'particular ' or 'specialised'.
He had the word specialised in his answer? I put a group of tissues working together towards a common function.
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Shabba101
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(Original post by Straight up G)
Doubt it unfortunately. The question was about assimilates being loaded into the phloem not translocation. One mark for the first sentence, maybe.
i thought translocation was the movement of sugars e.g sucrose in a plant?
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Ivo
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(Original post by Shabba101)
i thought translocation was the movement of sugars e.g sucrose in a plant?
It is, but the qu. wanted you to explain how sucrose is loaded at sink. So process of H+ ions being pumped out of companion cells by active transport etc.
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Shabba101
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(Original post by Ivo)
It is, but the qu. wanted you to explain how sucrose is loaded at sink. So process of H+ ions being pumped out of companion cells by active transport etc.
surely if you get chemistry related the H+ ions would come from the water moving out due to the increase in water potential?

:P
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arcticwombats
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Can someone please check my answers and give an estimate how many marks i got on the questions that i'm not sure about?

- the active transport question: i said it's a non passive process used to bring large substances, or polar substances in to the cell that are too big too diffuse through the phospholipid bi layer (forgot about ATP and against conc gradient... feel like an idiot)

- the one where you had to say what transports etc - i said - blood transports, exchange surface is the lungs, and valves control pressure ( i think all of these are wrong, fml )

- and for how seive elements are adapted - i just wrote they have no organelles, allowing transport of assimilates, do you think i'll get any marks for that

- also the calculation question, if you just put 18% and not18.00 % do you think you'll lose a mark????

cheers whoever answers this!

EDIT: oh, and for the where are meristems located, is root tips and stem tips enough for the 2 marks!??
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Straight up G
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(Original post by arcticwombats)
Can someone please check my answers and give an estimate how many marks i got on the questions that i'm not sure about?

- the active transport question: i said it's a non passive process used to bring large substances, or polar substances in to the cell that are too big too diffuse through the phospholipid bi layer (forgot about ATP and against conc gradient... feel like an idiot)

- the one where you had to say what transports etc - i said - blood transports, exchange surface is the lungs, and valves control pressure ( i think all of these are wrong, fml )

- and for how seive elements are adapted - i just wrote they have no organelles, allowing transport of assimilates, do you think i'll get any marks for that

- also the calculation question, if you just put 18% and not18.00 % do you think you'll lose a mark????

cheers whoever answers this!
1,1,1 and unsure really. Probably get the two marks. I looked through the past papers for similar questions, both times where they insist on sig figs or d.ps it says in the question explicitly in bold. though obviously in this question it says it implicitly, I think both of us will be okay with 18%.
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Shabba101
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Oh oh and for the mitosis question instead of writing 18% i put 82%!!
But i wrote a note on the side stating that i was aware nuclear division stopped at metaphase
so you just needed to add interphase + prophase

rekon they'll give me a mark ?
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Groat
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#273
(Original post by arcticwombats)
Can someone please check my answers and give an estimate how many marks i got on the questions that i'm not sure about?

- the active transport question: i said it's a non passive process used to bring large substances, or polar substances in to the cell that are too big too diffuse through the phospholipid bi layer (forgot about ATP and against conc gradient... feel like an idiot)

- the one where you had to say what transports etc - i said - blood transports, exchange surface is the lungs, and valves control pressure ( i think all of these are wrong, fml )

- and for how seive elements are adapted - i just wrote they have no organelles, allowing transport of assimilates, do you think i'll get any marks for that

- also the calculation question, if you just put 18% and not18.00 % do you think you'll lose a mark????

cheers whoever answers this!

EDIT: oh, and for the where are meristems located, is root tips and stem tips enough for the 2 marks!??
Why would you lose a mark for putting 18%. :eek:

I also put roots and stem tips for that question and after checking the OCR textbook that's exactly where they say meristem cells are.

I think you're right with the transport medium being the blood
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Ivo
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(Original post by Shabba101)
surely if you get chemistry related the H+ ions would come from the water moving out due to the increase in water potential?

:P
It is in fact the hydrolysis of ATP to ADP that releases the H+ ions which then can be actively pumped out of the companion cell.
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Ivo
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(Original post by Shabba101)
Oh oh and for the mitosis question instead of writing 18% i put 82%!!
But i wrote a note on the side stating that i was aware nuclear division stopped at metaphase
so you just needed to add interphase + prophase

rekon they'll give me a mark ?
But surely nuclear division means mitosis (i.e. PMAT), so calc. would be 100-12=88?
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Groat
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(Original post by Ivo)
But surely nuclear division means mitosis (i.e. PMAT), so calc. would be 100-12=88?
Yeah, nuclear division is mitosis. The table listed interphase then the stages of mitosis, so the working was either 100 - 82 = 18% or add the other stages.
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arcticwombats
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(Original post by Ivo)
But surely nuclear division means mitosis (i.e. PMAT), so calc. would be 100-12=88?
nah it was how much percent is made up of the nuclear divis (pmat) which was only 18%, with the rest being like G1 and G2 or something like that

... i think
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Ivo
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(Original post by arcticwombats)
nah it was how much percent is made up of the nuclear divis (pmat) which was only 18%, with the rest being like G1 and G2 or something like that

... i think
True, but I just did a diferent method of 1-(interphase)
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Ivo
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What do you guys reckon will be the raw mark for full UMS? Would you say this was easier/harder than previous years?
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arcticwombats
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i would say this is quite easy so like 45 or 46 for an A... dunno what it is in ums
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