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OCR Biology F212 Revision [3rd June 2013] (Now Closed)

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Reply 1460
Avatar for kited4
kited4
Original post by Sam_1996
Did you guys get around 0.6366 (or something like that) for the diversity index.


YES YES OH YES I DID YES:banana:
Original post by kited4
uhhh i put primary structure for the first questions xD is that wrong?
it's not my mark scheme. Anyway, I put Primary structure to and of-course it should be right, because primary structure is defined 'a sequence of amino acids'. I Dont see why not.
Do you actually have to underline Mycobacterium Tubercolosis?
Original post by MedMed12
7 marker on how the phagocytes destroy pathogens are binding to them or so



A in the 70s, maybe high 60s? depends how people have done.


for phagocytoes did you

talk about everything the engulfing , digestion, forming the phagosome, lysosomes releasing the hydorlytic enzymes, talk about pathogen having antigen and attaches to phagocytic cell, e.t.c
1st question was primary structure not polypeptide chain


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I messed up the phagocytosis question and wrote about lymphocytes. How many marks will i get out of 7 for this?

Pathogen engulfed by macrophage cells from the immune system
Removal of antigens from pathogens
Antigens presented on surface of engulfing cells
They then find the lymphocytes that can neutralise the particular antigen
Selection of correct T killer cells and T helper cells
Reproduction of T killer cells
T killer cells search for infected cells
T killer cells attach to infected cells
T killer cells secrete toxic substances (hydrogen peroxide) into
infected cells to kill the cell and the pathogens it contains
Original post by SomePotential
It's usually around 85/100, don't think it will be any different for this one.

do you guys mean 150 UMS? considering 100 isnt even a B :tongue:
Reply 1467
Avatar for Becky.96
Becky.96
For the question about why squirrels were conserved in the particular area of northumberland what did people put? I wasnt sure so I put it allows them to breed in there natural enviroment as part of the natural food chain and it maintains the biodiversity
Reply 1468
Avatar for exams567
exams567
Original post by Smuu
Same here! I'm not the only one :')


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me too! although i didnt realise untill now :s
Lovely paper
For the 7 marker on phagocytes i talked about the engulfing and lysins etc then i talked about macrophages presenting the antigens and then talked about immune response. I didn't think that just writing about the phagocytosis will get u 7 marks thats why i done immune response aswell..


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Original post by otrivine
for phagocytoes did you

talk about everything the engulfing , digestion, forming the phagosome, lysosomes releasing the hydorlytic enzymes, talk about pathogen having antigen and attaches to phagocytic cell, e.t.c


yes :smile:
Reply 1472
Avatar for JonnyD
JonnyD
15
I put that they're aesthetically pleasing and could attract tourism :/

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Original post by Liberty.
I wrote primary structure for the first question :frown: technically, that is what it was describing... or did I read the question wrong again!
And more silly-ass mistakes:
Spores instead of droplets
Only underlined mycobaterium instead of tuberculosis (probably spelt that wrong in the exam aswell)
Cystine instead of glycine

Why must Biology have such funnily spelt/sounding words :frown:?!


I put primary structure too :/ That *is* a sequence of amino acids.
And ahh, did we have to underline the Mycobacterium tuberculosis? Damn
Reply 1474
Avatar for JonnyD
JonnyD
15
Original post by Becky.96
For the question about why squirrels were conserved in the particular area of northumberland what did people put? I wasnt sure so I put it allows them to breed in there natural enviroment as part of the natural food chain and it maintains the biodiversity


In response to you :tongue:

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Reply 1475
Avatar for ssflcb
ssflcb
12
Original post by JonnyD
I put that they're aesthetically pleasing and could attract tourism :/

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I put that too !
Original post by MedMed12
yes :smile:



Good :smile: more:tongue:

good practise for me lol
Reply 1477
Avatar for Onkar-M
Onkar-M
I rounded it up to 0.64.
Woops.
Original post by JonnyD
In response to you :tongue:

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are the squirrels conserved to prevent inbreeding with other of the same type of squirrels so that the genetic diversity is not reduced?
Reply 1479
Avatar for exams567
exams567
hated biodiversity suggest questions! focused alot on food molecules :frown:

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