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AQA BIOL2~3rd June 2013~AS Biology (Now Closed)

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For your first question 1 mark for concentration, not sure about the age of snake because they were substituting the snake with a piece of filter paper so surely age doesn't matter.

for your second question 1 mark for first point. Don't know about the second as we don't know if a shorter or longer size is more beneficial for survival.

Thanks so much pal, hope you get an A :smile:

Reply 4341

Helpfulstudent

Original post by Liam2404

Thanks so much pal, hope you get an A :smile:

No problem, thanks hope we both get one. :wink:

Reply 4342

Liam2404

Original post by Helpfulstudent

No problem, thanks hope we both get one. :wink:

Aha i doubt it, using that unofficial mark scheme and what you just said I've got 69, which should be an A right, but i think unit 1 might drag me down. Will have to wait til results day I suppose :smile:

You've definitely got an A - your a walking mark scheme :wink:

Reply 4343

MrMikeEsq

Original post by Helpfulstudent

The answer really only required there to be 3 chromatids of different sizes.

possible combinations:
Screen shot 2013-06-03 at 20.45.52.png

Well my guesswork payed off this time!

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Reply 4344

Helpfulstudent

Original post by Liam2404

You've definitely got an A - your a walking mark scheme :wink:

haha, I've done so many papers so I know what they sort of want.

I've already got an A in biology for AS. I need a higher A at AS so that I can get my A* at A2 which is why I redid the AS units to get higher As.

Reply 4345

lifeisgood2012

improving you AS A to a higer A is not going to get you the A*... you need A* average on all A2 units and atleast An A for your overall A level

Reply 4346

Helpfulstudent

Original post by lifeisgood2012

improving you AS A to a higer A is not going to get you the A*... you need A* average on all A2 units and atleast An A for your overall A level

They say its an A at AS and 90%+ in both A2 units.

This is partially true. You need an A at AS at a certain UMS (don't know actual value). Only then can you be eligible to get the A*. I had quite a low A so even though I acheived an A the UMS wasn't enough. Ask your teacher.

Reply 4347

Liam2404

Original post by Helpfulstudent

Well Done! I'd be happy with a B tbh, I think a B is an excellent grade for such a hard subject. Good luck, hope you get it!! :smile:

You deserve to!

Reply 4348

Lucy_95

Original post by amar96

that doesnt stop growth...the asnwer was inhibiting protein synthesis

but technically if the bacterial cell bursts, it can't grow anymore... :P I think there will be a range of answers for this, but osmotic lysis is directly in the specification

Reply 4349

cc1805

i found the paper prettty easy

Reply 4350

Linked

When excess calcium is added to water, effervescence occurs and
A a clear colourless solution is formed.
B a cloudy suspension is formed.
C an orange-red flame is seen.
D a yellow flame is seen.

answers b - why? please can anyone help me :smile:

Reply 4351

cc1805

Original post by Linked

well its not c and d because there is no flame,
its added in excess so not all of it will dissolve so no colourless solution

leaves with B? :smile:

Reply 4352

Enn21

Hi, can someone link me the unofficial markscheme please?

Reply 4353

Aspiring Medic 7

Hey can somebody please tell me what 66 would probably be in terms of UMS?

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Reply 4354

tilownii

Original post by walkers38

Guys, I appreciate your criticisms about my mark scheme but hey! those were my answers. was just helping out. i do agree there are few flaws, but you know it better. it gives idea of marks and almost all accurate answers. no bashing please :cry:

Awwwww don't worry I personally thought ur mark scheme was spot on no worries thought it was great man!!! :biggrin:

Not trying to be a kiss ass but u know its true

Reply 4355

jojomojo

Original post by Wintabix

Hopefully because I wrote that too!

i said to use paper with no lipids on it

Reply 4356

x-Sophie-x

Did anyone write about horizontal gene transmission for the questions about why there were very few bacteria?

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Reply 4357

Mangodepo11

Original post by Aspiring Medic 7

Hey can somebody please tell me what 66 would probably be in terms of UMS?

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around 95% ums going of january ums convertion. This paper was harder so maye 98-97% ums.

Reply 4358

Linked

Original post by cc1805

well its not c and d because there is no flame,
its added in excess so not all of it will dissolve so no colourless solution

leaves with B? :smile:

i mean how would you know there is no flame?

Reply 4359

tilownii

Would I get any marks for saying that centromeres help chromosomes to line up along equator of cell and they help chromosomes to attach to spindle is this 2 marks please answered meeee!!!!!