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

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Reply 680
Avatar for Ché.
Ché.
Original post by ThePremierLeague
hi for 2 marks how do you define 'biodiversity'

thanks

You've probably got an answer already, but!?
- The variety of living organisms/life (1)
- [...], within and between habitats/species/ecosystems (1).


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Reply 681
Avatar for Lawlser
Lawlser
I have typed up every single question asked in every past paper except Jan 2013 which the mark scheme answer under it so if anyone wants it just give me a PM with your email and I'll send you them!
Reply 682
Avatar for Smuu
Smuu
13
Original post by lauren1brown
I've literally just finished all the content! Past papers tomorrow


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Ahh ok, I've got DNA and the smoking section left to do! I haven't done any past papers yet, so I'm hoping to do them tomorrow... Definitely going into the exam with a panic attack! But good luck to you :biggrin:


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Reply 683
Avatar for Smuu
Smuu
13
Original post by Ché.
Ya!
Little sections here and there...
Not much though; past papers are pending tonight and tomorrow...

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Ahh ok, we'll done! Good luck! I'm doing past papers tomorrow too :smile:


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Any general predictions? :smile:
Reply 685
Avatar for OHK567
OHK567
Can someone explain variation to me, both continuous, discontinuous along with genetic and environmental
Reply 686
Avatar for Gotzz
Gotzz
13
Original post by OHK567
Can someone explain variation to me, both continuous, discontinuous along with genetic and environmental


Discontinuous variation:
Influenced by few genes
Qualitative
No (or few) intermediates between two extremes
Small environmental effects
Continuous variation:
Influenced by many genes
Quantitative
Has a range of values between two extremes
No defined categories

Someone else can do the genetic and environmental :redface:
Reply 687
Avatar for own
own
Original post by OHK567
Can someone explain variation to me, both continuous, discontinuous along with genetic and environmental


Continuous it like height.
Discontinuous is like age, only 2 possibilities.
Genetic is like what you get from your parents, I.e. height if they are tall you probably will be.
Environmental is like in the 1800 people were shorter as they were more malnourished than we are now so we are taller as we have more energy for growth etc
Hopefully that's brief but concise :smile:
(edited 10 years ago)
Reply 688
Avatar for OHK567
OHK567
Original post by own
Continuous it like height.
Discontinuous is like age, only 2 possibilities.
Genetic is like what you get from your parents, I.e. height if they are tall you probably will be.
Environmental is like in the 1800 people were shorter as they were more malnourished than we are now so we are taller as we have more energy for growth etc
Hopefully that's brief but concise :smile:

Thank you
Reply 689
Avatar for OHK567
OHK567
Original post by Gotzz
Discontinuous variation:
Influenced by few genes
Qualitative
No (or few) intermediates between two extremes
Small environmental effects
Continuous variation:
Influenced by many genes
Quantitative
Has a range of values between two extremes
No defined categories

Someone else can do the genetic and environmental :redface:

Cheers understand pretty much everything now do u need any help??
Reply 690
Avatar for Ché.
Ché.
Original post by Smuu
Ahh ok, we'll done! Good luck! I'm doing past papers tomorrow too :smile:


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Thank you!
Have you done a past paper before!?


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Original post by Gotzz
So any predictions?


Revising atm, but since COPD came up in the last exam I think it's highly unlikely it will come up on monday's exam.

The three units are separated by blue, red and black; making "predicting" a bit easier.

The simpson's index came up in both the Jan 2010 and Jun 2010 exams, it hasn't appeared in the 4 exams after that (not sure if resits are included) so I think it might show up...
Original post by kimsiclez
This is great, thank you! What do the different colours mean?


No worries, glad I could help!

Red = Biological molecules
Blue = Food and health
Black = Biodiversity
Reply 693
Avatar for wndms
wndms
1
I have a question. Is antigen a name of a receptor for pathogens? Or is receptor and antigen a completly different thing?

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Original post by wndms
I have a question. Is antigen a name of a receptor for pathogens? Or is receptor and antigen a completly different thing?

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Antigen: A substance that causes the immune system to produce antibodies.

They will be found on the membranes of pathogens.

Receptor: Something that can detect chemicals, usually found on cell membranes.

http://asbiology101.files.wordpress.com/2009/09/4-5-the-immune-response.pdf
Reply 695
Avatar for oak12
oak12
9
anyone need any help?
Reply 696
Avatar for Nas.
Nas.
Hey guys, anyone got some notes I could use that cover the material for the exam?
Reply 697
Avatar for oak12
oak12
9
got any questions on topics?
Reply 698
Avatar for Nas.
Nas.
I'm gonna need to cover the whole unit in a day.
Quite a tall order :confused:
Original post by Nas.
Hey guys, anyone got some notes I could use that cover the material for the exam?


These are notes posted by lexafish on f212 specification. http://www.thestudentroom.co.uk/showthread.php?t=1296764

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