AQA B Biology- Core Principles

How did you find the paper?

Reply 1

InTeRRoGaToR

i thought it was ok
most of the questions were proper easy
n then there was baout 4-5 marks that were tough
even if i lose them .... n a couple more from points i missed......thats still 47/54 which is equivalent to 78/90 UMS......but the marks might be scaled up cos its first AS module for yr 12's and people wudnt have been too prepared for it

Reply 2

InTeRRoGaToR

dots were ribosomes

i sed it was competetive inhibition

Reply 3

*asha*

i put the same as interrogator

Reply 4

tiny tiger

InTeRRoGaToR

dots were ribosomes

i sed it was competetive inhibition

what was the other thing we had to label on the bacterium. It wasn't the cell wall, so what was it. I guessed capsule, but that's wrong.

And ye, it was competitive inhibition

Reply 5

*asha*

the capsules right. i stupidly put cell membrane grrrr. what did you guys get for the magnification question? and what did you put about the plasma membrane?

Reply 6

papz_007

the plasma membrane question got my brains thinking

wat u guys put down for that question?

Reply 7

*asha*

i put down about the phospholipids being hyrdrophillic head and hydrophobic tails allowing the movement of lipid solubule molecules through them and carrier protiens and channel protiens allowing movement of ions and polar molecues. Also that the plasma membrane is a selectively permeable membrane. I couldnt think of specific answers so i just put eveything i know about plasma membranes!!

Reply 8

datr

12

I also put how it is able to stretch slightly to fit it's contents and so that it can stretch when plant cells become turgid.

I also mentioned that because the membrane was fluid like it is capable of merging with lysosomes and micelles to allow for the passage of materials into and out of the cell.

was capsule!

Yeah I said the bi-layer has cholesterol as well for cell recognition.

I didn't know anything about this "capsule" though :confused:

i said ribosomes for the other thing though.

but remember it said three features :wink:

Reply 11

stratomaster

Yeah I said the bi-layer has cholesterol as well for cell recognition.

I didn't know anything about this "capsule" though :confused:

i said ribosomes for the other thing though.

but remember it said three features :wink:

This is what i wrote, I dont know how many marks i can get :X

1) Phospholipid Bilayer - Allows small polar and lipid soluble substances to diffuse through the phospholipids

2)Protein Pores -Channel and carrier proteins actively transport large non-polar substances such as glucose and ions.

3)Cholestrol - The cholestrol between phospholipds and proteins help to stabilize their position in the membrane.

Reply 12

stratomaster

dec0!

This is what i wrote, I dont know how many marks i can get :X

1) Phospholipid Bilayer - Allows small polar and lipid soluble substances to diffuse through the phospholipids

2)Protein Pores -Channel and carrier proteins actively transport large non-polar substances such as glucose and ions.

3)Cholestrol - The cholestrol between phospholipds and proteins help to stabilize their position in the membrane.

That's exactly what I wrote, except I mentioned protein channels and receptors need energy from ATP as well.

Reply 13

stratomaster

That's exactly what I wrote, except I mentioned protein channels and receptors need energy from ATP as well.

Good stuff, im sure there are many marking points anyway, as long as you give 3 distinct points and explain them well enough.

Reply 14

Kooldood

What did you lot get for the calculation? I got 16um, anyone confirm?

Reply 15

Kooldood

What did you lot get for the calculation? I got 16um, anyone confirm?

Yes i got 16 um

Reply 16

insparato

15

Me too If anyone wants the paper i can type it up. I asked for a copy of it.

I also said that glycocalyx is used for cell recognition (glycolipids) and cell signalling as well as antigens like the ABO antigen in the red blood cells, which is a cell surfacing glycoprotein.

Reply 17

Kooldood

What did you get for the enzyme part ii

Reply 18

insparato

15

The ethylene glycol one or the very last question?

Actually id like to type it out for you guys and ask for people to provide answers so we can get a much better idea of how well we've done.

Reply 19