OCR Biology F211 Exam - Tues 11'th January 2011

Wait. Isnt S phase just the small bit were chromosomes are checked and replicated? G1 and G2 is where orgnalles and cell grows and protein synthesis. That what it says in the book anyway.

Organelles dont go through growth - clearly says in the book 'replicated' P:

Dam I think I misunderstood the question. I was thinking about just the S phase for some reason and not the whole of interphase.

Which exam, since i just checked the past papers on the OCR site and see nothing of it

what about the histamine causing more permeability question? i put more substances that would not usually pass out of the capillary would do so and that the scells in the tissues would become plasmolysed because the water potential of the tissue fluid would decrease and water would leave the cells in the tissue

About the pathways the water takes throug the cell membrane - 2mark question .

I thought that was symplast and apoplast pathway?

So eurythrocytes might still get mark then?

I'm not sure if I liked this paper or not. I found a lot of it too ambiguous, and nothing on the heart came up - I could write a flipping essay on the damned thing -_-

For the "label the lung question", what did everyone put? I put bronchus, because it looked like one of the two branches, with the even smaller ones being bronchioles - but everyone I spoke to put bronchioles. Tbh I don't think the drawing was big enough to be able to tell, but maybe that's just me?

I also got confused at the last one. I forgot the difference between reliability and accuracy. Rambled on for a bit, probably got it wrong.

June 2009 - Question 5bi

http://www.ocr.org.uk/download/ms_09/ocr_40994_ms_09_gce_jun.pdf

I think i put something like that too .. and for the one before about histamine making the muscle contract or something, that was to do with cell receptor molecules / target cells etc right? the questions were a bit strange, hard to know what they wanted from us.



i put symplast etc for that one too.. quite a few people did i think but a lot of people but about cell membrane bilayer channel proteins etc! maybe they'll except both because the question could be either? (or lets hope so...)
oh gosh most of the questions were way too vague! or those "suggest..." questions .... where was all the "meaty" stuff on the heart, lungs, translocation, haemoglobin, lymph, cardiac cycle ... etc that we spent soo long revising!!? i think the "suggest" questions and the ambiguity on this paper made it harder than a lot of the past papers we've done

For the "label the lung question", what did everyone put? I put bronchus, because it looked like one of the two branches, with the even smaller ones being bronchioles - but everyone I spoke to put bronchioles. Tbh I don't think the drawing was big enough to be able to tell, but maybe that's just me?.

Yeah symplast and vacuolar pathway across the membrane, going through channel proteins would be wrong even if the question asked how water moved through the phospholipid bilayer i think bc water molecules are an exception to that rule as theyre small enough to travel through the hydrophobic tails. but yeah symplast and vacuolar pathway

anyone doing OCR chemistry F321 on Tuesday? We should start discussing that imho

hahaha!!
every one is confused on this question Adil

Let's hope bronchus is right then xD

For that water thing - I'm pretty sure the question was, "How does water move across the cell surface membrane?"
Surely symplast and vacuolar are describing what the water does once it's passed through the plasma membrane, not describing how water actually enters the cell in the first place?
I put that water on its own is small enough to pass through the bilayer via osmosis, but if there are solutes / larger molecules with it, then channel proteins may have to facilitate the diffusion.?

yeah but unlike biology chemistry cant go that vague dont wana get over confident but i think chemistrys a definite A for me.