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OCR Biology AS F211/F212 exams Thursday 21st May & Monday 1st June 2015

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Can someone explain RNA replication
I dont get it
DNA replication is a piece of cake:smile:
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Does anyone know what/ how much detail we have to know about the different types of bonding between R-groups in the tertiary structure of proteins?
Original post by dexter-morgan_
Does anyone know what/ how much detail we have to know about the different types of bonding between R-groups in the tertiary structure of proteins?


You need to know about sulfide bonding I think it's hydrophilic and hydrophobic and there's hydrongen boding too


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Sorry if someone's already asked this, what topics/ areas are being predicted to come up?
Hey guys, I made a chatzy for biology so if you have any questions and stuff you can ask them there.
http://us19.chatzy.com/79823553403722
Who else on here feels the next paper is going to be just application ( a lot ).. Instead of the general trend in past papers ? I'm kinda thinking it's pointless even doing them :/


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Is there a predicted paper for this unit and if so could someone link it? :smile:
Original post by Anymorefor123
Who else on here feels the next paper is going to be just application ( a lot ).. Instead of the general trend in past papers ? I'm kinda thinking it's pointless even doing them :/


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They're all application grr


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Hi can anyone get the bio fact sheets i really need them PM if you need.
Original post by kingaaran
Following the F211 mock paper I made and posted on Page 1 of the thread, I have attached an F212 mock paper that I have made to this post.

I hope you find it useful. Once again, do let me know if you find any errors - I haven't thoroughly looked over it yet.

Hope it's helpful :smile:


Is there a mark scheme for this?
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ImOnHD
Can anyone go through the action of T lymphocytes and B lymphocytes please?
Original post by ImOnHD
Can anyone go through the action of T lymphocytes and B lymphocytes please?


I'm not 100% myself but I'll do my best.

T lymphocytes:
Surface is covered with receptors
Receptors bind to antigens presented by phagocytes
Each T lymphocyte has a different receptor on its surface (specific/complementary to different antigens)
Binding of T lymphocyte receptor to complementary antigen activates the T lymphocyte and is known as clonal selection
Activated T lymphocyte then undergoes clonal expansion
This is when it divides to produce clones which differentiate into different types of T lymphocytes that carry out different functions:
1) T helper cells --> release substances to activate B lymphocytes
2) T killer cells --> attach to antigens and kill the cell
3) T memory cells --> remember the specific antigen

B lymphocytes:
Surface is covered with antibodies
Antibodies bind to antigens to form antigen-antibody complex
Each B lymphocyte has a different shaped antibody on its surface
B lymphocyte antibody binds to complementary antigen
This together with substances released by T lymphocytes activates the B lymphocyte
Again clonal expansion happens where the B lymphocyte divides by mitosis
This time the B lymphocytes differentiate into...
1) Plasma cells --> produce antibodies
2) B memory cells --> record the specific antibodies needed to bind to the antigen

Sorry if this just confused you even more :/
I just copied it out of my CGP Revision Guide
Original post by mortal infinity
How much do we need to know about investigating enzyme activity? Do we need to know how to carry them out or set examples?


I was wondering this cos its in the book but never seen a question on it
Does anyone have the mark schemes for June 09 and Jan 10?
Original post by MotorboatMyGoat
Does anyone have the mark schemes for June 09 and Jan 10?


http://www.ocr.org.uk/Images/59656-mark-scheme-june.pdf

http://www.ocr.org.uk/Images/57860-mark-scheme-january.pdf
(edited 8 years ago)
Does anyone know if whether it's right that in alpha glucose the groups are the same of both sides (H on top OH on bottom) but in beta they are different on each side (only one side has the OH on top) ?
Original post by r.rhiann
Does anyone know if whether it's right that in alpha glucose the groups are the same of both sides (H on top OH on bottom) but in beta they are different on each side (only one side has the OH on top) ?


Yes


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What topics do you find hardest? Think biodiversity is hardest but maybe thats because i don't find interesting. But biochemistrys really easy but my friends all say it's hard
HEY GUYS!

Here's some notes for F212 you may find useful xx
2_1_1_biological_molecules_draft.pdf171.6KB
2_1_2_nucleic_acids.pdf97.5KB
2_1_3_enzymes.pdf115.0KB
2_2_1_diet_and_food_production.pdf159.5KB
2_2_2_health_and_disease.pdf250.4KB
2_3_1_biodiversity.pdf133.9KB
2_3_2_classification.pdf139.8KB
2_3_3_evolution.pdf156.6KB
2_3_4_maintaining_biodiversity.pdf157.4KB
Original post by ashii1234


Thank you :smile:
(oops sorry, didn't scroll down)
(edited 8 years ago)

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