This discussion is now closed.

Check out other Related discussions

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

Exam was fair but back me and say if you didn't revise you we're screwed.one question - I put collagen had a triple helix and haemoglobin has a double helix - I've contradicted myself haven't I ?

Posted from TSR Mobile

Reply 1481

sylly

Original post by Onkar-M

I rounded it up to 0.64.
Woops.

You might still get the mark, as it is correctly rounded

Reply 1482

Loiks94

11

Was the kingdom animale or protoctist for the water bear and why?

Reply 1483

bambi77122

Original post by Student296

I messed up the phagocytosis question and wrote about lymphocytes. How many marks will i get out of 7 for this?

Pathogen engulfed by macrophage cells from the immune system
Removal of antigens from pathogens
Antigens presented on surface of engulfing cells
They then find the lymphocytes that can neutralise the particular antigen
Selection of correct T killer cells and T helper cells
Reproduction of T killer cells
T killer cells search for infected cells
T killer cells attach to infected cells
T killer cells secrete toxic substances (hydrogen peroxide) into
infected cells to kill the cell and the pathogens it contains

I've put down exactly the same thing that you've written down! honestly i don't know whether we'll be able to get the marks :frown:

Reply 1484

Majeue

1

Original post by Student296

I messed up the phagocytosis question and wrote about lymphocytes. How many marks will i get out of 7 for this?

Pathogen engulfed by macrophage cells from the immune system
Removal of antigens from pathogens
Antigens presented on surface of engulfing cells
They then find the lymphocytes that can neutralise the particular antigen
Selection of correct T killer cells and T helper cells
Reproduction of T killer cells
T killer cells search for infected cells
T killer cells attach to infected cells
T killer cells secrete toxic substances (hydrogen peroxide) into
infected cells to kill the cell and the pathogens it contains

Most likely 0 marks, maybe one if you're lucky :tongue:

Reply 1485

sylly

Original post by krishkmistry

Exam was fair but back me and say if you didn't revise you we're screwed.one question - I put collagen had a triple helix and haemoglobin has a double helix - I've contradicted myself haven't I ?

Posted from TSR Mobile

Haemoglobin has some alpha helix structures, but it is globular so it's not actually said to have a helical structure.

Reply 1486

MedMed12

21

Original post by otrivine

Good

more

good practise for me lol

aww
what UMS did you get on F212?

Reply 1487

Sakib

What did everyone write for the centrifuge question?

Reply 1488

MrMeep2580

i drew out the amino acid thing. owp. I also put for the Haemoglobin and Collagen differences.

Collagen is mainly consisted of 35% glyceine. Haemoglobin is consisted of many various amino acids.
Collagen is left hand helix whereas haemoglobin is alpha helix.
haemoglobin contains four tertiary subunits. collagen contains three tertiary subunits.

Reply 1489

Loiks94

11

Original post by bambi77122

I've put down exactly the same thing that you've written down! honestly i don't know whether we'll be able to get the marks :frown:

of course you will,

Reply 1490

niceguy95

14

1a) Primary structure/polypeptide chain

b) nh2CHRCOOH

ci) it is strong

Cii)

Collagen is fibrous protein, secondary structure (explanation of hydrogen bonds, coiling, alpha helix, folding, beta sheet), teitary structure (3D shape, futher coiling and folding, ionic bonds, dusulphude bond/bridge, hydrophobic and hydrophilic interactions), quaternary is final shape. Collagen consists of 3 long polypeptide chains

Di) binds with O2 due to affinity to form oxyhemoglobin to transport O2 in red blood cells

Ii) haemoglobin differences:
4 polypeptide chains
Soluble in water
Globular protein

These are answers for first Question I think

Reply 1491

otrivine

14

Original post by MedMed12

aww
what UMS did you get on F212?

I got 129UMS , you should have done the Jan 2013 paper, it was a pleasure and less biodiversity, we have a 9 marker question on how to preserve food, very nice

Reply 1492

Onkar-M

Original post by sylly

You might still get the mark, as it is correctly rounded

Hope so
Would be silly not to!
Exams make me do funny things lol! :frown:

Reply 1493

MrMeep2580

Original post by Loiks94

Was the kingdom animale or protoctist for the water bear and why?

animal because it was multicellular, could move and was eukaryotic

Reply 1494

Hello...

For the people asking about the mycobacterium question I think mycobacterium is the answer, mycobacterium tuberculosis is a specific strain of the infective agent

Reply 1495

Moon1ight

15

Anyone put high tensile strength for the property of collagen ?

Posted from TSR Mobile

Reply 1496

MedMed12

21

Original post by otrivine

I got 129UMS , you should have done the Jan 2013 paper, it was a pleasure and less biodiversity, we have a 9 marker question on how to preserve food, very nice

well done you!!
yeah it was a nice paper I got 80/100 on that as a mock and A was 71
just so annoyed at my silly mistakes as its easy UMS to save on A2 papers :/ I did well in f215 mock so hopefully the real thing I might/could be OK with.
Was initially aiming for full UMS on this paper :P such a fail aha!

Reply 1497

Dr. Django

12

Original post by niceguy95

1a) Primary structure/polypeptide chain

b) nh2CHRCOOH

ci) it is strong

Cii)

Collagen is fibrous protein, secondary structure (explanation of hydrogen bonds, coiling, alpha helix, folding, beta sheet), teitary structure (3D shape, futher coiling and folding, ionic bonds, dusulphude bond/bridge, hydrophobic and hydrophilic interactions), quaternary is final shape. Collagen consists of 3 long polypeptide chains

Di) binds with O2 due to affinity to form oxyhemoglobin to transport O2 in red blood cells

Ii) haemoglobin differences:
4 polypeptide chains
Soluble in water
Globular protein

These are answers for first Question I think

For the amino acid question instead of writing out the formula I drew an amino acid and labelled it :/