The Student Room Group

OCR Biology F212 (Molecules, Biodiversity, Food and Health)- 21st May 2012

Scroll to see replies

Original post by salma25
What do you have to know for measuring biodiversity

simpsons index
quadrats -transects
is there a belt transect?

tunnelling
shaking the tree and catch the insects that fall on white paper
pitfall

i might be making up names i tend to that quite a lot


ANYONE????
Original post by Dan12
I'm an A2 student as well; this could be a synoptic question which relates to mutations. This would be a brilliant question for F215

can u ask me questions?
Reply 222
Original post by The Illuminati
K I'll give it a try. Tar in cigarettes smoke contains carcinogens which are reaches the lungs via inhalation. The carcinogens can enter the nucleus and cause a mutation by altering DNA. The mutation may lead to uncontrollable cell division (cell divisions exceed Hayflick limit), apoptosis doesn't happen so this progresses to form a tumour.

Dunno how many marks that is but I doubt it's 12!


I'd probably give it 7. You could talk about conversion of protooncogenes to oncogenes. And refer to it as a malignant tumour. Two examples of mutagens are benzopyrene and formaldehyde. By the way, stating that tar destroys cilia would give you 2 marks. Also, refer to the mutation as a random mutation. You could also maybe talk about transcription being slowed down and it being switched off.
You have good synoptic knowledge though.
Reply 223
Original post by otrivine
can u ask me questions?


From what unit? I'm going out now so I'll think of some questions
Original post by Dan12
From what unit? I'm going out now so I'll think of some questions


unit 2 :wink: please
Reply 225
Have a go at the question I posted earlier.
Outline how lung cancer is caused (12 marks)
Refer to two mutagens in your answer
Original post by Dan12
Have a go at the question I posted earlier.
Outline how lung cancer is caused (12 marks)
Refer to two mutagens in your answer


benopyrene
carcionogenos deopisted
-mutation
the carcinogen enters nuclueus in alveoli
and changes genetic material and can cause cell to divide uncontrollably. and affects DNA replication and affects activity of enzymes
these are enough points the book does not mention more reason
Reply 227
Original post by otrivine
benopyrene
carcionogenos deopisted
-mutation
the carcinogen enters nuclueus in alveoli
and changes genetic material and can cause cell to divide uncontrollably. and affects DNA replication and affects activity of enzymes
these are enough points the book does not mention more reason


I'd probably give you 5 marks
- protooncogenes are converted to oncogenes
- no apoptosis (programmed cell death)
- forms malignant tumour
- tar destroys cilia (2 marks for saying three words)
- another mutagen is formaldehyde
- say the carcinogens are in the tar

the first two points relate to F215 more but these points would be in the mark scheme for this question.
Reply 228
Original post by otrivine
benopyrene
carcionogenos deopisted
-mutation
the carcinogen enters nuclueus in alveoli
and changes genetic material and can cause cell to divide uncontrollably. and affects DNA replication and affects activity of enzymes
these are enough points the book does not mention more reason


a) What does cellulase do? (2 marks)
b) Explain the benefit of humans having the gene that codes for cellulase? (4 marks)
c) Palladium is an inhibitor of cellulase. Explain how palladium could inhibit cellulase (4/5 marks)
Reply 229
you dont get 12 markers in f212 lol......

max 8
Original post by Dan12
I'd probably give you 5 marks
- protooncogenes are converted to oncogenes
- no apoptosis (programmed cell death)
- forms malignant tumour
- tar destroys cilia (2 marks for saying three words)
- another mutagen is formaldehyde
- say the carcinogens are in the tar

the first two points relate to F215 more but these points would be in the mark scheme for this question.


:eek::eek: Are these all in the course???
Finding it hard to revise for this exam, so much memorising to do. Only a week to go :cry2:
Reply 232
Original post by alilonghorn
Finding it hard to revise for this exam, so much memorising to do. Only a week to go :cry2:


i think i've memorised nearly everything now (I hope) :/ good luck to you anyways :biggrin:
Original post by has87
i think i've memorised nearly everything now (I hope) :/ good luck to you anyways :biggrin:


I've been working on Chemistry for the last week, feel like there's no room in my head for Biology too! I'm sure it'll be alright once I get in to it but at the moment just looks like there's too much to do, too much to learn before I even start to revise it :/ good luck to you as well :h:
Reply 234
Original post by alilonghorn
I've been working on Chemistry for the last week, feel like there's no room in my head for Biology too! I'm sure it'll be alright once I get in to it but at the moment just looks like there's too much to do, too much to learn before I even start to revise it :/ good luck to you as well :h:


Aaah okay, I'm gonna work on chemistry next tuesday.. you doing AQA?
Original post by has87
Aaah okay, I'm gonna work on chemistry next tuesday.. you doing AQA?


Yeah AQA Chem 2, so glad I'm not doing the Chem 1 resit today!
Reply 236
i hate this exam!!!
Original post by narli
i hate this exam!!!


can u ask me question?
Original post by otrivine
can u ask me question?


have u done all the past papers?
Original post by undertaker1
have u done all the past papers?


yep :wink:

Quick Reply

Latest