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

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how many marks would you get out of 2 for the percentage question if you put it in decimals because you didn't times by 100? And showed the working out... ?

Reply 4001

John Dogg

Original post by Little Wing

It's not the same thing. I'm not sure if you can write about the type of glucose molecules becasuse how could you tell that Agrose (or whatever it's called) has B-Glucose?

hmm.. i saw the bonds at the bottom then top and thought beta glucose -_- oh well hopefully i scrape a decent grade and never have to do biology EVER again :biggrin:

Reply 4002

Trimbag01

Original post by Mutley44

Argh I put Biochemical and Genetic for forms of variation :s-smilie:

Thats 7 marks gone

What did everyone put for the one about sheep?

that sheep one confused me so much. i just put that they choose the ones with best characteristics, then mated them with eachother so a more productive sheep would be made etcetc...baffled.

Reply 4003

mattymorse

Original post by eimmas.

I thought that it was definitely a challenging paper - but, I kind of expected there to be a lot of 'suggest' type questions because OCR has recently decided to put more of those bad boys as an extra bonus. The questions about the experimental design was really hard and I completely didn't revise the food tests from first year. (I'm a second year resitting the exam)

Reducing sugars are tested by benedicts solution right? how are non-reducing sugar tested? I put that you needed to carry out the reducing sugar test and add something - I didn't even name what was added :')

Had to boil with HCl first then cool and neutralise with sodium carbonate! Then carry out benedicts as before

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Reply 4004

Little Wing

I think it was a model because it can be changed or improved on.

Reply 4005

babit

Original post by John Dogg

i put environmental and genetic variation... :'(

thats what i wrote, it didn't even occur to me to right about continuous and discontinuous :|

Reply 4006

mattymorse

Original post by Little Wing

Amyloses glucose molecules are not alternating.

I just realised :frown:

aww dear!

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Reply 4007

niaghez

why are enzymes flexible?!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Reply 4008

Axion

Original post by TheGirlNextDoor

I have no idea if it said hyphae in the question but all I saw was "...many nuclei scattered around..." and concluded that it was fungi :smile:

it was a one marker at the bottom of the page under the table right?

Dont want to have missed a double page :O

Reply 4009

hackashaq

Original post by babit

thats what i wrote, it didn't even occur to me to right about continuous and discontinuous :|

So how many marks out of 7 would we get if we wrote about only environmental and genetics?

Reply 4010

phaseshift

Original post by babit

thats what i wrote, it didn't even occur to me to right about continuous and discontinuous :|

Didn't write about continuous or discontinuous, didn't think to so I just waffled on about allopatrick and sympatrick speciation.

Reply 4011

username714290

I loved the question on smoking, hated everything else though
There was so many questions on enzymes! :frown:

Reply 4012

raj007007007

Thanks Harry M. People were telling me I got it wrong because I didn't use a colorimeter

Reply 4013

twizzzzzzter

Original post by MajonaZ

I put sodium carbonate, I'm guessing that's wrong? :frown:

Sodium Carbonate is a base, so HOPEFULLY (for you) will be accepted. However, hydrogencarbonate is what is most commonly accepted in the mark schemes.

Reply 4014

Student296

They took the mick with the lyrics, yes, they thought putting lyrics into the exam paper will make everything OK...

Reply 4015

Axion

Original post by niaghez

why are enzymes flexible?!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Lol I guessed.

i said the active site is flexible so that the susbtrate is more likely to collide, form a substrate enzyme complex, and for the reaction to take place.

Reply 4016

hackashaq

the new species is a prokaryote right?

Reply 4017

TheFliprunner

Original post by John Dogg

i put amylose was made of a glucose monomers and that sugar was b glucose. same thing right ?

I said Similarities: they were both monosaccharide ring structures
Differences: the glycosidic bonds were in different places for the agar and all the bonds are 1,4 for amylose

Reply 4018

TheGirlNextDoor

What did people put for the, "explain why the lock-and-key and induced-fit are called models?" Oh no... I mean suggest why..

I said that it's a simplification of the actual mechanism :confused:

And what about the question where you had to write the letter? I put M and now I'm doubting myself (I think I put M... the one with the boiled enzyme... Oh man, it's not M, is it? :erm:

)

Reply 4019

username714290

Original post by mattymorse

Had to boil with HCl first then cool and neutralise with sodium carbonate! Then carry out benedicts as before

This was posted from The Student Room's iPhone/iPad App

Isn't it sodium hydrocabonate?