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

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Reply 980

HeyMickey6

Similarities between collagen and haemoglobin ?

Reply 981

t()m

Original post by g.k.galloway

It must have loads of functions :smile:

tbh I think it's one of those really detailed things that we don't really need to know about, they just tell us it exists :biggrin:

I hate it when they do that but hey :cool:

Ok cool

. But do you know of past paper question I want to check my knowledge for protein synthesis?

Reply 982

TheSnail

Original post by coco_madem0iselle

How I learnt it was DNA helicase (don't think we need to know that specifically) catalyses unzipping of DNA strands and breakage of hydrogen bonds.
blah blah blah (haha)
Then DNA polymerase catalyses linkage of hydrogen bonds and then the sugar phosphate backbone reforms with phosphodiester bonds.

I think just mentioning DNA polymerase and the hydrogen bonds/sugar phosphate backbone reforming gets you a mark.

Ah right okay I get it now, I'd never come across the DNA helicase before :smile:

thanks

Reply 983

TheSnail

Original post by t()m

Ok cool

. But do you know of past paper question I want to check my knowledge for protein synthesis?

Not specifically but...

Outline the process of protein synthesis with regard to transcription and translation [8 ish]

Reply 984

saycrackagain

Any predictions for the paper please?

Reply 985

coco_madem0iselle

Original post by g.k.galloway

Ah right okay I get it now, I'd never come across the DNA helicase before :smile:

thanks

No problem :smile:

We don't need to know the enzyme name, it was just in this animation my teacher showed us to help us understand haha, I've never seen it mentioned on a mark scheme but I write it down anyway :P

Reply 986

wndms

What's the difference between interbreeding and cross breeding? Are they even different?

Posted from TSR Mobile

Reply 987

SheriB

Does anybody have the mark scheme to the f212 january 2013 paper? please say, i need it.

Reply 988

TheSnail

Original post by wndms

What's the difference between interbreeding and cross breeding? Are they even different?

Posted from TSR Mobile

Inbreeding refers to breeding between relatively closely related members of one species.

crossbreeding refers to breeding between different breeds or something...like dogs I guess or in this exam cows or some kind of food source - so not the same species.

If that makes any sense... :smile:

EDIT - why the neg...do we have some veggies out there or something?

(edited 10 years ago)

Reply 989

Tania2k9

Original post by SheriB

Does anybody have the mark scheme to the f212 january 2013 paper? please say, i need it.

here u go: F212_MS_Jan13 (1).pdf

Reply 990

Tania2k9

hi can someone please test me?

Reply 991

lucasluke

The functions of RNA came up in January 2013 here was the mark scheme.
2 DNA unable to leave nucleus ;
3 (m)RNA , copies / is a copy of , gene(s) / part of DNA ;
4 (RNA) passes , out of nucleus / through nuclear pore /
into cytoplasm ;
5 to / at , ribosome / RER ;
6 ribosome made of (r)RNA ;
8 (RNA needed for) protein synthesis / formation of
polypeptides / AW ;
8 amino acids brought by (t)RNA ;
QWC: 2 roles of RNA ;

Reply 992

xKaylax

What would be the significance of a LOW value for Simpson's Index of Diversity on a planned development?
Like if it's high then the planned development wouldn't go ahead because it's high biodiversity and needs to be conserved etc...
so if it's low would that mean that the plans would go ahead? Or would they not because the habitat is less stable and unlikely to adapt to change?

Also what is the role of DNA polymerase?

Reply 993

sharifma

Original post by HeyMickey6

Similarities between collagen and haemoglobin ?

Both have Quaternary structure (more than one polypeptide chain)
Both have polypeptide chains
Both made of amino acids
Both have hydrogen bonds
Both have peptide bonds

Reply 994

SheriB

Original post by Tania2k9

here u go: F212_MS_Jan13 (1).pdf

Thanks so muck :colondollar:

i honestly didnt think anyone would have answered me.

how do micro organism cause food spoilage?

Reply 995

lucasluke

Original post by xKaylax

No, the opposite. A development would be built on an area of high Biodiversity as the area can withstand change

Reply 996

Tania2k9

This means the environment is not stable and more species need to be introduced. Development has destructed species habitats therefor species no longer adapted enough to cope with the environmental condition. ( probably not right)
2) DNA polymerase forms a covalent bond between the free nucleotides and its exposed bases in DNA replication.

Reply 997

t()m

Original post by g.k.galloway

Not specifically but...

Outline the process of protein synthesis with regard to transcription and translation [8 ish]

Transcription:

Gene is exposed by breaking the hydrogen bonds between nitrogenous bases.

mRNA forms complementary strand RNA.
RNA Leaves nucleus through nuclear pore

Transcription
RNA arrives at ribose
tRNA gather amino acid in triplet order of RNA.

Forms peptide bond

Sill stop codon and
Protein released by ribosome

Reply 998

Tania2k9

Original post by SheriB

Thanks so muck :colondollar:

i honestly didnt think anyone would have answered me.

how do micro organism cause food spoilage?

no problem,

visible growth growing colonies on food
using an external digestion process to release enzymes that break down the food molecules

i need to know another one, do u know?

Reply 999

Char_lotteee

Original post by milworthy

IN SITU
advs: larger populations can be monitored, organisms are kept within their natural environment to which they are adapted. Animals can select their mates, the size of the gene pool is maintained (lower chance of inbreeding and disease susceptability), animals can still be tagged and tracked. nature parks can be set up which can protect animals from hunting, and these areas can also be used for scientific research and leisure activities such as hiking so there are benefits for everyone.

disadvantages- it is harder to monitor the health of members of larger populations. Also, it is difficult to enforce hunting laws and many will continue to poach or log illegally. There is high competition in the wild and it might be difficult for some species to survive- and there is an increased mortality amongst the young. When you set up areas for nature reserves, this can often cause conflicts with the locals who can no longer use the land- for example for religious reasons (such as sacred sites for prayer). Tourists in the area can also feed protected animals which causes them harm.