AQA Biology BYB 2 &amp; 3 June 3rd: how&#x27;d it go?

tomen123

thats complete crap

I don't see you writing anything more sensible -it sounds right to me!

Reply 23

but then again it would - I wouldn't write it if it sounded completely wrong.lol =)

Reply 24

tomenthedon

5

Future African game vet

but then again it would - I wouldn't write it if it sounded completely wrong.lol =)

DNA replication has to happen before mitosis (and prophase) and it can't replicate

Reply 25

Future African dude is more or less right, that's what I submitted for my answer to that question too. It's an application question, it said "suggest" too, so there isn't just one answer. Regardless, you would probably get a mark for saying inhibits, slows down or even stops DNA replication before cell division etc, so that cell division can't occur. Wouldn't that be the aim of doctors with an anti-biotic such as that? To stop cancer of course. What's the point in slowing down cancer cell replication. It'll just kill the patient slowly.

Reply 26

With the vein question on BYB3 did you guys put down skeletal muscle contractions increase pressure from A----B to push blood along? Blood flows in one direction passed the valve and not backwards or something. And for the other question which was about the special stocking. I put down that the stocking's tighter around ankle because that's where the damaged valves/veins are and so pressure there is increased meaning blood in the veins there are always moving forward and not back. Something like that.

Reply 27

For the Xylem question I put
-Lignified walls (1 mark) for strength (1 mark)
-No organelles interrupting water flow such as cytoplasm, mitochondria etc (1 mark ) minimal resistance to water flow (1 mark)
-Endless tube or tunnel with no endings (1 mark) Free movement of water in a column

Reply 28

Also put perforations for lateral movement of water xD

Reply 29

Oh yeah one more, the last question, I only got 2/4 marks, max.

I put the xylem sucks in water because when it moves towards leaf due to transpiration (all the malarki on water potential) and this causes a pressure sucking in the surroundings. Also water's cohesive, so it'll suck the water in the syringe up.
What about the phloem part? I died on that part :/

Reply 30

snorty_swirl

lost on
BYB3

The question about what happens to lactate.

and our teacher never taught us much about the structure of xylem

For lactate, I put:

-Can dissociate into H ions lower blood/muscle Ph (can cause muscle fatigue)

-Is oxidised

-Turned into pyruvate and CO2 etc.

I hoped to have scored 4/4 for that, but then, hey you know, I hope for alot. :biggrin:

Reply 31

tomenthedon

thats complete crap

actually it's not! I got 100% on genes and genetic engineering so It must have been right after all! - sorry :rolleyes:

Reply 32

shahrukh24

6

Future African game vet

actually it's not! I got 100% on genes and genetic engineering so It must have been right after all! - sorry :rolleyes:

you may have just got full marks in ums marks not raw marks though..

Reply 33

shahrukh24

you may have just got full marks in ums marks not raw marks though..

good point -lol :rolleyes:

Reply 34

Don.k

I got a grade B for BYB2
I got a grade E for BYB3 < dissapointed. (re-taking).
msg me if u got similar and feel as crap as i do. (overall i got a grade d).

Reply 35

i'm no superman

15

Ah I hated BYB2 but somehow managed to get 79/90 (a) in it and 102/120 (a) in BYB3 in June. I remember leaving the exam thinking to myself I ****** up big time. I was completely blank with the question aphids for BYB2 and really struggled with the questions on radioactive tracers. Really was expecting a B/C in that module. I also left the very last four mark question in BYB3 after running out of time as well as guessing the ECG question and a few other obscure ones about the heart. Really don't know how I got through AS Biology only using CGP and a few past papers! I'm just glad I'm not resitting anything - there's just so much content in each module.

I just realised I like my 79's. I got 79/90 in BYB1, BYB2, and Unit 3 (Nuffield) lawl! :p:

Reply 36

username165864

13

!MEna

Ah I hated BYB2 but somehow managed to get 79/90 (a) in it and 102/120 (a) in BYB3 in June. I remember leaving the exam thinking to myself I ****** up big time. I was completely blank with the question aphids for BYB2 and really struggled with the questions on radioactive tracers. Really was expecting a B/C in that module. I also left the very last four mark question in BYB3 after running out of time as well as guessing the ECG question and a few other obscure ones about the heart. Really don't know how I got through AS Biology only using CGP and a few past papers! I'm just glad I'm not resitting anything - there's just so much content in each module.

I just realised I like my 79's. I got 79/90 in BYB1, BYB2, and Unit 3 (Nuffield) lawl! :p:

Congratulations on your grades. I thought I messed up BYB2, and I did! YAY FOR ME!

Reply 37

x.beth.x