OCR Biology F212 - 18th Jan 2011

Original post by girls_allowed_1

Can you please send the link to the paper with the mark scheme! Urgent lol

sorry i jss saw ur reply. for june 2010 paper plz go to page 1 or 2 as mentioned earlier..

Reply 61

I redid the june paper and ended up getting and ended up getting lower number of marks then last time :confused:

im just reviewing first 2 units now,

are there any biodiversity specialists about?

Reply 62

TJH

Im pretty hot on biodiversity and classification + biological molecules, but not so good on health and disease, Any questions just ask :smile:

Reply 63

heartskippedabeat

OP

10

Original post by svk_92

i feel the exact same way, i havent even started biodiversity, and im a resit although this is my first time doing ocr! i am going to screw up so badly :eek:

Ahh

I'm resitting too, I've hardly done any revision because I've had other exams. I just really don't want to have to resit it again! Good luck, I'm sure you'll do fine :smile:

Reply 64

TJH

Dirty kinky peter (can change to penelopy) came over for great sex ..Domain Kingdom Phylum Class Order family Species

Reply 65

arvin_infinity

3

We use benedict 's reagent again for non-reducing sugar?!
Can somebody explain me what all these crap about!?!!!!!? :eek:

Reply 66

Original post by arvin_infinity

We use benedict 's reagent again for non-reducing sugar?!
Can somebody explain me what all these crap about!?!!!!!? :eek:

Basically you do the test for a reducing sugar first so add Benedicts and heat at 80 degrees the test result will not be red-orange solution.

So therefore means we have a non reducing sugar, we have to hydrolyse it by adding an Acid, Hcl in this case, this breaks the covalent bond (glycosidic bond)
then we add sodium hydrogen carbonate solution to neutralize the solution.

Then we re do the Benedicts test which will now give it a positive result of a red solution.

The sugar is basically split from a non reducing sugar to a reducing sugar.

Understand it a little better?

Reply 67

Singh1

Original post by TJH

Dirty kinky peter (can change to penelopy) came over for great sex ..Domain Kingdom Phylum Class Order family Species

HAHAHA our Biology teacher taught us: Knickers Pants Come Of For Great Sex LOL
Kingdom Phylum Class Order Family Genus Species

Reply 68

Well guys the end looms and the f212 paper arrives tomorrow, how hard do you think it is going to be and what module could have the greatest proportion, because I hate module three, where as I am really strong in the other two

Reply 69

Original post by tonystark

Well guys the end looms and the f212 paper arrives tomorrow, how hard do you think it is going to be and what module could have the greatest proportion, because I hate module three, where as I am really strong in the other two

The last paper was more unit 2 from what I thought, Im hoping more unit 1 personally thats the easiest, Im hoping OCR are feeling nice and have little biodiversity

Reply 70

I think everybody hates biodiversity, and would someone mind telling me all the experiments we have to learn, you don't have to give the full detail. Just the experiments

Reply 71

gradu

Gonna go cotch and read through the text book! :smile:

Should be fine :biggrin:

Reply 72

Original post by tonystark

I think everybody hates biodiversity, and would someone mind telling me all the experiments we have to learn, you don't have to give the full detail. Just the experiments

if you have the OCR book the experiments are the biological test ones

Starch - Add iodine solution
Positive result = colour change from orange to black

Reducing sugar - Add benedicts reagent and heat at 80 degrees
Positive result = colour change from blue to red solution

Non reducing sugar- if reducing sugar test is negative, hydrolyse sugar with HCl acid cool and neutralise with sodium hydrogen carbonate and add benedicts and heat at 80 degrees
positive result should now occur: Colour change from blue to red solution

Protein
buiret reagent
colour change from blue to lilac/purple

Lipids
Add ethanol then mix with water
positive result: white emulsion forms on top of water

Reply 73

tesha_al

11

Original post by Singh1

HAHAHA our Biology teacher taught us: Knickers Pants Come Of For Great Sex LOL
Kingdom Phylum Class Order Family Genus Species

mine taught us Keep Penises Clean Or Feel Genital Syphilis ...yup she was weird 3 years ago and i can still remember it :s-smilie:

Reply 74

TJH

Original post by tonystark

I think everybody hates biodiversity, and would someone mind telling me all the experiments we have to learn, you don't have to give the full detail. Just the experiments

mainly just the tests for proteins , non reducing and reducing sugars, Starch, and just how enzymes effect the rate of reaction and how enzymes can be affected by certain factors. you will be asked like how to test something, or how different factors effect an Investigation :smile:

good luck

Reply 75

How about for the rate of enzyme activity will the experiments be in the exam

Reply 76

arvin_infinity

3

Original post by atman7

Basically you do the test for a reducing sugar first so add Benedicts and heat at 80 degrees the test result will not be red-orange solution.

So therefore means we have a non reducing sugar, we have to hydrolyse it by adding an Acid, Hcl in this case, this breaks the covalent bond (glycosidic bond)
then we add sodium hydrogen carbonate solution to neutralize the solution.

Then we re do the Benedicts test which will now give it a positive result of a red solution.

The sugar is basically split from a non reducing sugar to a reducing sugar.

Understand it a little better?

same no. of post btw :rolleyes:

totally different with what my teacher said. Yours makes sense tho :biggrin:

But again CGP says : after doing non-reducing sugar test , annoyingly if the result of this test is +ve the sugar could be reducing or non-reducing !!!! so confusing :confused:

+rep

Reply 77

Original post by arvin_infinity

same no. of post btw :rolleyes:

totally different with what my teacher said. Yours makes sense tho :biggrin:

But again CGP says : after doing non-reducing sugar test , annoyingly if the result of this test is +ve the sugar could be reducing or non-reducing !!!! so confusing :confused:

+rep

lol didn't notice the post thing, didn't know i had that many,

Im using the OCR endorsed book rather than the CGP one they said what I've said
just use what I said and you'll be fine usually they just ask you what happens they won't ever ask you to name the sugar or anything so don't worry about it :smile:

usually you get given the sugar and its usually a disacharide (sucrose or maltose) which always splits to make glucose anyways :smile:

Just out of interest is anyone planning on learning the vaccination part on the production of new medicines that kinda thing?

And could anyone give me a few advantages and disadvantages to Ex Situ (conservation of an endangered species outside its natural enviroment)

Reply 78

Flint_09

about what will come most definitely...Since everyone complains about Biodiversity, I assume more questions will be based on that topic. So, everyone, revise it throughly!!

Reply 79