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

Reply 660

tssf_skye

15

Original post by kited4

That's correct :biggrin:

Glycogen is a good storage molecule because:
It does not affect the water potential of the cell as it is insoluble
It is compact and can therefore store a lot of energy in the bonds
It is highly branched which facilitates enzyme action of hydrolysis of the glycogen into glucose for respiration

:smile:

Ah, that makes sense! Thanks!

Reply 661

cookiess

3

Original post by joe1545

Who's done June 2012 f212? WOW that paper killed me, i got 65/100 yet i was still 2 marks off an A :frown:

(((

I got 71/100 that was a really hard paper...but the answers were so obvious...

Reply 662

Sam_1996

Does anyone have the june 2012 paper?
Thanks

Reply 663

Smuu

13

Anyone still revising content?

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Reply 664

Joe4567

Could someone describe the roles of RNA and the use of fertilisers please?

Reply 665

Ché.

Original post by Smuu

Anyone still revising content?

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Ya!
Little sections here and there...
Not much though; past papers are pending tonight and tomorrow...

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(edited 10 years ago)

Reply 666

lauren1brown

Original post by Smuu

Anyone still revising content?

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I've literally just finished all the content! Past papers tomorrow

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Reply 667

Ché.

Original post by Joe4567

Could someone describe the roles of RNA and the use of fertilisers please?

ROLES:
Messenger RNA (mRNA) - carries the genetic information copied from DNA in the form of a series of triplet codes - three bases.

Transfer RNA (tRNA) - is the key to figuring out the code in mRNA carried by the amino acid towards the end of a polypeptide chain which will be used when the mRNA next signals its need.

Ribosomal RNA (rRNA) - associates with a set of proteins to form ribosomes which physically move along an mRNA molecule, catalysing the assembly of amino acids into protein chains.

Does that help!?
I mean, we aren't expected to know all the forms of RNA, however, as far as their roles, each form illustrates a functional role.
:biggrin:

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Reply 668

Gotzz

13

Original post by kited4

yes sorry :P Ive been revising since 9am as i have 3 exams next week! my brain is frazzling! Think it's time to stop :rolleyes:

Well done for sticking to it for so long, wish I could do the same. I have 3 exams too :frown:

Good luck!

Reply 669

MedMed12

21

anyone know what full UMS was in June 2012? :/

Reply 670

Ché.

Original post by MedMed12

anyone know what full UMS was in June 2012? :/

Well?
Generally, it is known to be around 86/100 to guarantee full UMS conversion.
:biggrin:

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Reply 671

cookiess

3

Original post by Joe4567

Could someone describe the roles of RNA and the use of fertilisers please?

RNA takes 3 forms
tRNA: bring amino acids to ribosome in a certain order to make a protein. This order is coded for by the base sequence of mRNA
mRNA: It's complementary to the template strand of DNA and the same as the coding strand of DNA. It forms proteins at the ribosomes because it provides the coding instructions to make a protein. It codes for the sequence of amino acids e.g. its primary structure
rRNA: RNA forms ribosomes...I think O_O

Fertilisers: They increase soil fertility and provide ions which are essential for the plant to function. E.g. nitrate, potassium and phosphate ions.

P.s. you might want to check accuracy, this is from my memory lol

(edited 10 years ago)

Reply 672

cookiess

3

Original post by Sam_1996

Does anyone have the june 2012 paper?
Thanks

It's on the OCR website :smile:

Reply 673

Joe4567

Original post by Ché.

ROLES:
Messenger RNA (mRNA) - carries the genetic information copied from DNA in the form of a series of triplet codes - three bases.

Transfer RNA (tRNA) - is the key to figuring out the code in mRNA carried by the amino acid towards the end of a polypeptide chain which will be used when the mRNA next signals its need.

Ribosomal RNA (rRNA) - associates with a set of proteins to form ribosomes which physically move along an mRNA molecule, catalysing the assembly of amino acids into protein chains.

Does that help!?
I mean, we aren't expected to know all the forms of RNA, however, as far as their roles, each form illustrates a functional role.
:biggrin:

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yeah that's helpful, thank you for that

Reply 674

username1058686

1

hi for 2 marks how do you define 'biodiversity'

thanks

Reply 675

MarkProbio

7

Original post by ThePremierLeague

hi for 2 marks how do you define 'biodiversity'

thanks

The range of living organisms.
Three levels of biodiversity are habitat, species and genetics.

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Reply 676

milworthy

1

Original post by ThePremierLeague

hi for 2 marks how do you define 'biodiversity'

thanks

I don't know if this is my question to answer but, biodiversity involves the variety of life in a habitat. This can be seen through variety between members of the same species, the differences between species and the range of different habitats in which a species can live. It also takes into account the number of species in an area and the relative abundance of each species. A measure of biodiversity is the simpsons biodiversity index.

Reply 677

Gotzz

13

Original post by ThePremierLeague

hi for 2 marks how do you define 'biodiversity'

thanks

From the mark scheme, for two marks you could say either of these points:
Variety of life
Variety of habitats
Number of different species
Variety within species

Reply 678

username1058686

1

Original post by Gotzz

From the mark scheme, for two marks you could say either of these points:
Variety of life
Variety of habitats
Number of different species
Variety within species

thanks bro

Reply 679

Ché.

Original post by Joe4567

yeah that's helpful, thank you for that