Official AQA GCSE Biology Unit 2 22nd Janurary NEW SPEC

Correct me if I'm wrong, but I swear the mark schemes are written after the paper has been sat

Nope, they are out already for the examiners

Yeah same!
Erm for the how to make enzymes I wrote something like this:

The DNA contains amino acids. The ribosomes put the amino acids in a specific order to make an protein which in this case is an enzyme..

Even though that doesn't seem like a lot for 3marks, I obviously expanded it slightly! But, that was simply all you had to write...

Correct me if I'm wrong, but I swear the mark schemes are written after the paper has been sat

Correct me if I'm wrong, but I swear the mark schemes are written after the paper has been sat

Yay!.. I think I covered most of the things there! Also, for the question where it said how the oxygen moves to the mitochondria.. Is it something along the lines of diffusion.. high concentration to low concentration allowing the oxygen move into the cell?

No, you had to talk about the mitochondria. I wrote that protein synthesis occurs in the ribosomes. From their, energy is needed from mitochondria for this to be done. Proteins are created when amino acids fold over eachother, which needs energy

for the validity one, i wrote use a quadrat, do a random sample, and control the test by using the same quadrat.

I'm pretty sure it's been over 10 minutes!

and what about the advantage of using skin cells? i wrote it does not raise any ethical, immoral and religious concerns

Yeah High Oxygen (Blood through the Cell Membrane) ---> Low Concentration, because diffusion works along a concentration gradient. The diffusion happens through random movement, but there is a net overall movement from High to Low Concentration...Also not sure if'd you get a mark for this (I think it was a 3 marker? ) but the concentration gradient is maintained because respiration is constantly occurring so O2 is converted into CO2 and the blood always supplies more oxygen and carries away excess CO2. So there is always high O2 in blood supply and low O2 in mitochondria (within the cell) Im not very good at making my answers concise, but i'll get the marks (hopefully)

Not sure, as it was only a 2 mark question (i think) then i guess you will get a mark for stating an enzyme that is used in industry + what it does (isomerase - turns glucose syrup into fructose syrup) and then the other mark for giving its use (slimming foods because fructose syrup is sweeter than glucose syrup)

i completely understand why u wrote that, if that where true; then wouldn't all of the kids inherit the disease?, I think that only one of the parents had the dominant allele whilst the other had two recessive alleles which caused them to get the disease.

Does anyone know if you don't annotate your punnet square how many marks you will drop (if any)??

I put:

"The oxygen moves into Part A via diffusion, this is due to there being a lower concentration of oxygen in the cell and a higher concentration of oxygen in the blood, this means the oxygen molecules will move down the concentration gradient across a partially permeable membrane into the mitochondria"

How many marks would that get>