Upcoming Edexcel AS Biology: Unit 2 exam on 26 May 2011

I mentioned genetic drift, inbreeding depression, reintroduction into wild, use of stud books in my zoo answer... what did other people write??

For the bacteria questions, the awnser was evenly spread the bacteria all over the petri dish to create accurate results whilst using gloves.

The first thing in bold - you are absolutely right, it is a capsule, the cell wall was already labelled I think, but nevertheless it was capsule, see the annotations here on this link.

The second thing in bold, again, you're right!

what did everyone put for the telophase q?

hello how did you find edexcel unit 2 biology?? can i ask you for the question about fertilised eggs i put that nucleus removed from patients body and fused with egg cell and put into bone marrow is that correct? and for the question about how to put bacteria i put bacteria shoud be suspended into agar? the last question about reliable i put that it is not reliable as it was tested on only one bacterium
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are these similar to what you got?

Umm...i don't think the slime capsule is right..that's cuz there was no LABEL for the cell wall..i'm super sure about that..so it's gotta be cell wall..and a the question said that the diagram showed a TYPICAL prokaryotic cell..and typical cells dont have slime capsules, slime capsules are only SOMETIMES present..so yeh

There was an unlaballed solid, thick, black line preceding the jelly, wavering, jagged structure, i.e. the cell wall. Preceding the thick black line (cell wall) was the empty tubular surrounding (thin double black line) - cell surface membrane.

Cell walls are linear, composed of carbohydrates in straight chains from the beta glucose monomers. We had to label a non-straight structure, otherwise known as the capsule. Cell walls can not be wavy like that, they surpress the hydrostatic pressure from within the cell, and completely unfold, maximising like an over-inflated balloon so that we see a line like this: _____________________

Okay heres what I can remember.. first the shape question.. with that part about which area showed an endemic species.. which was D coz it had that flag shaped thingy.
Then there was that tensile strength of nylon question?
What was gene locus? And that question abt which species.. the one with the less number of alleles or more was at a greater advantage..and then why did two samples from the same species vary?
That magnesium and calcium question was pretty easy.
i thought this was a very generalized paper... none of the really detailed theory came apart from RER and Golgi Bodies question =/
will the boundary be higher or lower for a generalized paper =/

It wasnt wavy it was the same shape as the membrane and did you see the link about the june 09 paper which clearly shows the slime capsule to be a completely different shape to the cell membrane and cell wall
It was only a one mark question anyways

Exactly! The shape was regular - and clearly a Cell Wall! Good luck if you want to argue with Snow Leopard, there have been people on here all day trying to say it was a cell wall.. but getting nowhere!

By high does that mean 60/80 for an A =/

ARE YOU SAYING IT WAS STRAIGHT LIKE THIS LINE: _________________ ?

Lol, please prescribe yourself to specsavers - like, now. :|

Chemically and logically a cell wall cannot be deflated like a shrivelled prune or semi-wavey ocean, it has to withstand the immense internal hydrostatic pressure of the prokayote and is stretched like rubber band under a tonne of dense gold.

I assure you, the layer we had to label was alternating gently in its peaks and troughs, as flacid as a floppy banana.

ARE YOU SAYING IT WAS STRAIGHT LIKE THIS LINE: _________________ ?

Lol, please prescribe yourself to specsavers - like, now. :|

Chemically and logically a cell wall cannot be deflated like a shrivelled prune or semi-wavey ocean, it has to withstand the immense internal hydrostatic pressure of the prokayote and is stretched like rubber band under a tonne of dense gold.

I assure you, the layer we had to label was alternating gently in its peaks and troughs, as flacid as a floppy banana.