F212 june 2015 unofficial mark scheme

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TSR4LYF
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OCR A Biology F212 June 2015
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1i Peptide bond (1 mark)

ii Hydrolysis reaction - addition of water will break peptide bond (2 marks)

iii ?

2. ?
3. ?
4. ?
5. ?
6. ?
7. ?
8. ?
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Rishalll31
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Enzyme 5 marker
Then the 3 things the student did wrong on the table
How would the guy make it valid
Test tube 6
Repeat the experiment why ?
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gmb_1995
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The last one was the tick box of the glycerol, phospholipid and cholesterol. I am not sure which order but I believe the questions were:
Useful in membrane stability
Contains fatty acids
Insoluble in water

Cannot remember the other 3
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gmb_1995
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What were the mistakes he made in the table?

(Original post by Rishalll31)
Enzyme 5 marker
Then the 3 things the student did wrong on the table
How would the guy make it valid
Test tube 6
Repeat the experiment why ?
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Don Pedro K.
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(Original post by gmb_1995)
What were the mistakes he made in the table?
He forgot to put the units for one of the columns, he gave the wrong units for time in the last column (the noob put (m) like wat the heck), and the final error was the he said "amount" of pepsin instead of "volume".
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gmb_1995
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(Original post by Don Pedro K.)
He forgot to put the units for one of the columns, he gave the wrong units for time in the last column (the noob put (m) like wat the heck), and the final error was the he said "amount" of pepsin instead of "volume".
Ahhh, I got 2 of those! I missed off the last one you mentioned. Goddamn. But thanks for that
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pezhman
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(Original post by gmb_1995)
The last one was the tick box of the glycerol, phospholipid and cholesterol. I am not sure which order but I believe the questions were:
Useful in membrane stability
Contains fatty acids
Insoluble in water

Cannot remember the other 3
Contains only Oxygen, Carbon and hydrogen
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SRezkallah
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One of the questions asked about the structure of antibodies and their function and the last question was the lipid table, what is the test for lipids and what is the lipid content of mycoprotein (Quorn) compared to animal meat
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TSR4LYF
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Try and remember which question number they were if you can guys!
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fotevaf
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I don't know what the order is, but here are the questions I remember

tick the boxes:
Useful in membrane stability
Contains fatty acids t, p
contains glycerol t,p
Insoluble in water
Contains only hydrogen oxygen and carbon c, t


explain the significance of a low value for simons index

give reasons why the ___ lynx should be conserved

explain how antibodies do their role against pathogens

compare fibrous and globular proteins using haemoglobin and collagen as examples

explain how an enzyme breaks down a substrate

draw a line for a fixed amount of inhibitor

explain how pepstitatin structure compares to pepsin


explain 3 changes he should've made whilst making the graph

explain one development the student could've made to make his experiment more valid

give the term used for beaker 6 (control group/test)


fill in the blanks, can't remember
variation is the ____


label the diagram
1. antigen (receptor
2?
3. phagosytic vesicle?
4 lysosome

calculate the change in mean wheat yield
state units

how to carry out selective breeding for a higher yield

explain other reasons why wheat yield may be increased in (later year) compared to (19... something)

explain how the distribution changed

why sample fenced area? for the deer

importance of sampling.


describe how biodiversity is measured by both species evennes and richness

explain what phylogeny is and how it relates to classification.
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SamChy98
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For the haemoglobin and collagent 8 marker could you have spoken about their structure? E.g. primary, secondary, tertiary and quat for haemoglobin and then the collagen molecules and things for collagen?
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pezhman
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(Original post by SamChy98)
For the haemoglobin and collagent 8 marker could you have spoken about their structure? E.g. primary, secondary, tertiary and quat for haemoglobin and then the collagen molecules and things for collagen?
I think you could say they have different sequence of amino acids in primary structure which leads to have different 3-d shapes in tertiary structure. Collage has 35% glycine in its molecule and hase covalent bond between college molecules that are known as cross-linked . Collage 3 polypeptide chains, haemoglobin 4polypeptide chains . Collagen is left handed alpha helix
No hydrophilic,hydrophobic attraction in collagen
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