This discussion is now closed.

Check out other Related discussions

OCR Biology AS F211 May 2012

Reply 780

Alotties

10

Original post by AishaTara

same

two daughter cells genetically indentical to parent cell- same dna, and dna polyermase checks for mutations
:s-smilie:

That's what I put also! The question stumped me for a bit so I left it until near the end :smile:

Reply 781

AishaTara

14

Original post by naman

Any unofficial markschemes yet?

yes, get everyone to remember all the questions first. post all the questions oyu remember and how many marks, then we'll all say our answers and conclude which ones will be excepted.

1. a question with the answer mitosis
2. dna replication one
3. homologous chromosome one
3. ciliated epithelum where its located and its function
4. extracellar thing
labelling D, E, F
two features of the cell which would not be visible in prokaryotics cells
something in cytoplasm of prokaryotes and not in eukaroytes

Reply 782

niaghez

Original post by AishaTara

same

two daughter cells genetically indentical to parent cell- same dna, and dna polyermase checks for mutations
:s-smilie:

i didnt write about mutations. i just said that in order to have genetically identical daughter cells they need the dna from the parent and that the cell could not form without dna....

Reply 783

AishaTara

14

Original post by mathsclown

Last question i wrote it increases rate of flow of the sugar solution from source to sink my head was gone

same I went in nervous as usual, but thought I was well prepared then blanked out :/

Reply 784

AishaTara

14

Original post by Neena

How many marks was that question, I just put to make identical cells and the DNA is important for the chemical reactions in the cell? So it has to be copied?

2 marks

dw grade boundaries will be low like Jan I suspect due to the amount of how science works

Reply 785

itsmehello

2

OMG. I went through this last night but could not remember the answer

Old past papers from old spec http://pastpapers.org/AS/biology/transport/2005_Jan_2803_01.pdf
Look at page 10. It's the exact graph -.-

I wrote it decreases in pressure because it divides to smaller vessels
more resistance...

In the markscheme for old spec paper it says
qualified ref to distance from heart e.g. further ;
friction / resistance (to flow) ;
ref to increasing volume of e.g. capillaries; A surface area of capillaries
idea of dissipation of energy in elastic recoil ;

(edited 11 years ago)

Reply 786

AishaTara

14

Original post by niaghez

i didnt write about mutations. i just said that in order to have genetically identical daughter cells they need the dna from the parent and that the cell could not form without dna....

yeah makes sense sounds right. I guessed tbh
im sure several answers are exceptable

Reply 787

Neena

Original post by AishaTara

2 marks

dw grade boundaries will be low like Jan I suspect due to the amount of how science works

Oooh hopefully, how many marks out of 60 was it to get a B in jan?!

Reply 788

wacac

1

for the replicate the genetic material q

i put that the genetic material must be copied for the new cell to have genetic info during nuclear division, i commented that without genetic info it would not be able to carry out protein synthesis etc and the cell would die

Reply 789

AishaTara

14

Original post by itsmehello

OMG. I went through this last night but could not remember the answer

Old past papers from old spec http://pastpapers.org/AS/biology/transport/2005_Jan_2803_01.pdf
Look at page 10. It's the exact graph -.-

omg same I've done the question but forgot completely the answer. I knew I recognised the graph. what does the mark scheme say?
on no wait this question says B and D which would refer to hydrostatic pressure and tissue fluid being pushed over across the vein, whereas our question didn't ask about the vein, only about the artery.

Reply 790

niaghez

this is going to sound REALLY stupid but i thought root hair cells have mitohondria for active transport? because it was a 4 mark question, so i wrote process is active transport and root hair cells are specialised because of large SA, it protrudes out into the soil.... then i wrote it had mitochondria but i dont think it has it :frown:

Reply 791

Alotties

10

Original post by Neena

Oooh hopefully, how many marks out of 60 was it to get a B in jan?!

38/60 for a B in Jan, so wasn't too bad
Hoping for around the same!

Reply 792

AishaTara

14

Original post by Neena

Oooh hopefully, how many marks out of 60 was it to get a B in jan?!

72% for an A.
Type ocr grade boundaries Jan 2012 into google

Reply 793

AishaTara

14

Original post by niaghez

this is going to sound REALLY stupid but i thought root hair cells have mitohondria for active transport? because it was a 4 mark question, so i wrote process is active transport and root hair cells are specialised because of large SA, it protrudes out into the soil.... then i wrote it had mitochondria but i dont think it has it :frown:

it does have mitochondria

Reply 794

naman

14

Was it a hormone that was leaving the cell in the question with a diagram? I put insulin (a hormone)

Reply 795

Neena

Original post by Alotties

38/60 for a B in Jan, so wasn't too bad
Hoping for around the same!

Oh! That sounds fairly ok, I think I got atleast 30 out of 60 on this paper, so possibly a C and a B if im lucky?

Reply 796

AishaTara

14

Original post by naman

Was it a hormone that was leaving the cell in the question with a diagram? I put insulin (a hormone)

it didnt ask for what it was, it said name an extacellular protein so i wrote hormone.
Did you get an answer of exocytosis before or after that question :s-smilie:

Reply 797

niaghez

Original post by naman

Was it a hormone that was leaving the cell in the question with a diagram? I put insulin (a hormone)

same

Reply 798

AishaTara

14

Original post by itsmehello

OMG. I went through this last night but could not remember the answer

Old past papers from old spec http://pastpapers.org/AS/biology/transport/2005_Jan_2803_01.pdf
Look at page 10. It's the exact graph -.-

I wrote it decreases in pressure because it divides to smaller vessels
more resistance...

In the markscheme for old spec paper it says
qualified ref to distance from heart e.g. further ;
friction / resistance (to flow) ;
ref to increasing volume of e.g. capillaries; A surface area of capillaries
idea of dissipation of energy in elastic recoil ;

damn i had resistance and distance but may have been too vague in my answer :s-smilie:

Reply 799

sumsum123

2

Original post by Neena

Aww I should have put that! I talked about the mitochondria becomming damaged so no more ATP was produced for the reaction to happen. I was going to talk about the enzyme, but forgot it was 'Cotransporter'

That would be right too I think? I dont know if I am right. I wrote that at start the amount of sucrose was increasing because of kinetic energy and more ATP was being made so more hydrogen ions transported out and more sucrose&hydrogen ions transported back in. Then it decreased as you move away from the optimum temp. then the cotransporter protein became denatured so no sucrose could be transported into the phloem.

Confusing question, hoping I got one mark out of that lool

OCR Biology AS F211 May 2012

Related discussions

Latest

Trending

Trending

Articles for you