AQA Biology Unit 1 January A-S 2012 *EXAM FINISHED*

Anybody gonna admit to negging me?

Edit: Ouch - I was talking about my post up there! #968! Didn't really want any more lol..

Anyway, does any one know the names of the three different types of active transport? I can't find them anywhere in the AQA Nelson Thornes textbook.

Anybody gonna admit to negging me?

Edit: Ouch - I was talking about my post up there! #968! Didn't really want any more lol..

Anyway, does any one know the names of the three different types of active transport? I can't find them anywhere in the AQA Nelson Thornes textbook.

You've asked this SO many times fmllllllllllll

Cellular Response
T-Cells are produced in bone marrow and matured in the thymus gland. T-Cells are covered in proteins that bind to the Antigen-Representing Cells' antigen. This activates the T-Cell to do 2 things - release substances that stimulate the activation of B cells/ T cells bind to antigen on pathogen and release perforin; killing the pathogen.

Humoral Response
B-Cells are produced and matured in bone marrow. Each B-Cell has different shaped antibodies on its surface that are complementary to different antigen's. When the antibody on the surface of a B-Cell meets a complementary shaped antigen, they bind forming an antigen-antibody complex (think of enzyme-substrate complex). Once activated the B-Cell divides by mitosis into plasma cells which secrete antibodies specific to the antigen.

Monoclonal antibodies have the same variable region and are produced by identical B-Cells (Plasma Cells)

Should go into more detail but that should be sufficient...

Hello

thanks mocking bird that also helped me to understand also mocking bird can you please explain to me how the co transport of a glucose molecule this includes the sodium potassium pump. Its on page 64 on the nelson thrones book but i don't really understand it.

Hello there

How're you?
Thread isn't busy today fmllllllllllllll. bio is <333

I'm absolutley knackered to be honest hahah, im having another break day as i just cant bring myself to do anymore proper revision how about youu?

& Yeah Need to get them (repeated) questions going latet... People seem to appear when that happens

Haha me too! I went to sleep straight after school
Probably going to get the spec open and test myself soon

Lmfao. Haha I swear we've done emphysema like 100 times now, it better come up lmao.

I'm really scareeeeeeed

Just looked at why you possibly got negged:
"Had my mock Bio today - was the June 2011 paper. Got 51/60..."

And that's not a great mark? kthanksbye.

2 different types carrier proteins and co-transporters

LOL you're the first person on TSR I've seen that knows that "parr".

Haha fair enough. I was just annoyed because for a lot of questions it was stupid things to lose marks on such as including minor terminology. And I was beaten by this guy I hate

Oh well, I'm aiming for 90 UMS, so realistically I think a mark of 54 or above should be enough. What do you think it'll be for 100 UMS?

The different types of active transport? Don't think its specified in the spec so doubt we need to know. Probs just the Na+K+ pump or is that something else?

Lmfao.
Haha, 51/60 is around 92ums on that paper - what you on about?!? 55 is 100.

Oh really? I thought the UMS boundaries were really high like Chemistry..you need like 69/70 for 100 UMS in the CHEM1 papers apparently.

OH, so imma aim for 55/60 then..thanks

Hello there




Cotransport of glucose:
1) Na moves through Na-K pump from the epithelial cell (low conc) to the blood (high conc) via active transport.
2) This lowers the concentration of Na in the epithelial cell further, so Na from inside the lumen moves into the epithelial with glucose by co-transport via facilitated diffusion.
3) The concentration of glucose is now higher in the epithelial cell than in the blood, so it moves through carrier or channel proteins by faciliated diffusion into the blood and is then transported away.

I find it easier to imagine with a picture:


(edit: i didnt make this image so it does contain some irrelevant stuff, just for a visual though :P)

Thank you. Final question is the lumen same as the intestine if not what is the lumen then

Haha yeap, they're quite low. 55 is the MAX it will be for 100 (45/60 for an A), but with papers being as low as 37, the grade boundary for 100 is 48/49.


How's revision and how are you revising?