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

Yeah, thats exactly what I did I explained the bonds too, you get marks for the bonds (I like studied the haemoglobic question for my first exam ahha).
Then it said say three things different from Haemoglobin and Collagen;
I put Haemoglobin is globular, but collagen is Fibrous.
Haemoglobin has 4 sub units, Collagen has 3.
Haemoglobin consists of 2 alpha and 2 beta, but Collagen has just 3 alphas.
They used the prosthetic group as the example, I was like WHAT R U DOING.

Anyone put that tb is transmitted by contaminated beef ? I've deffo seen this in a lot of papers previous to this one


Posted from TSR Mobile

Technically you're meant to underline or italicise latin names, but OCR don't seem to mind this. I couldn't remember the first bit so I just but M. Bovis (which the text book says.)

Because when writing the name according to binomial system you underline if it's handwritten

Technically you're meant to underline or italicise latin names, but OCR don't seem to mind this. I couldn't remember the first bit so I just but M. Bovis (which the text book says.)

For the question about the pathogen, didn't you have to talk about lymphocytes because they also help destroy the pathogen (killer T cells). I wrote nothing about the process of phagocytosis, but wrote about antigen presenting and clonal expansion and differentiation and what they all do and so on........ please anyone??

uhhh i put primary structure for the first questions xD is that wrong?

I thought TB was badgers .. but i think it's transmitted by droplets mostly but, it can be caught by eating meat too

The question wanted phagocytosis as it said after the bacterial pathogen has bound to the receptor on a phagocyte :/

For the 6 marker on collagen,

did they want you to describe primary, secondary, tertiary and quaternary structures?

As well as some specifics (every 3rd is glycine) ?

I know but when it does that it is digested and the antigens are presented on the phagocyte's surface... the other pathogens in the body are destroyed by killer Ts as well aren't they??

Guys, I wrote for the selective breeding that two plants with high disease resistance were taken and bred assexually, to produce a offspring that also had high yield, then I said about removing the plants without disease resistance and how you could test this, then I said about inbreeding the plants etc... I also said it takes a long time over many generations but eventually the allele for disease resistance would become more common


How many marks would I receive for this? Thanks

Since the bacterial pathogen has already been digested and destroyed, only the antigens remain

Yeah, you can easily get 6 marks if you didn't include specifics you'll get a mark for something silly like 'hydrogen bonds form during the secondary structure' so, definitely

For the question about the pathogen, didn't you have to talk about lymphocytes because they also help destroy the pathogen (killer T cells). I wrote nothing about the process of phagocytosis, but wrote about antigen presenting and clonal expansion and differentiation and what they all do and so on........ please anyone??

Completely agree.

However did you put all your figures to the decimal places on the stated figures - that's a mark I think


Posted from TSR Mobile

what about other invaded cells?