AQA A/S Biology - Biology and Disease (BIOL1)

Reply 380

SS92

partysunil

what books are everyone using?
anyone simply using the AQA text book?

ye just that and going through past papers atm

Reply 381

partysunil

cool - i think it's the only real way tbh :s-smilie:

! It's crazy that we have no real past paper material!!!!!

Reply 382

billet-doux

14

Have you all done loads of past papers?

Reply 383

partysunil

it's too late to get my own revision guide out of preference - i got the oxford AS biology one and found it a little difficult to read really... so i'll stick with AQA text boooook! It's the best one cos it's endorsed etc.. so if u know it all u know it all :wink:

- did ur schools give it to u/give u access to the online learning space - we had to pay for it ourselves...

also any1 know where the answers in the AQA text book exam style questions r?

Reply 384

PhyMath

1

You have to get the school to pay for the website to see the ansers I think. You need a nelson thornes username and password to see the answers.

Reply 385

username163092

19

partysunil

it's too late to get my own revision guide out of preference - i got the oxford AS biology one and found it a little difficult to read really... so i'll stick with AQA text boooook! It's the best one cos it's endorsed etc.. so if u know it all u know it all :wink:

- did ur schools give it to u/give u access to the online learning space - we had to pay for it ourselves...

also any1 know where the answers in the AQA text book exam style questions r?

They're from actual past papers - look at the dates on them, then find the mark scheme (e.g. freeexampapers) :wink:

Reply 386

achibachi

1) a number of different species of bacteria can cause outbreaks of food poisoning. explain how using monoclonal antobodies would enable a scientist to identify the species of bacterium involved in a particular outbreak of food poisoning.

2)the length of mitochondria can vary from 1.5 to 10 mircometers but their width never exceeds 1 micrometer.explain the advantage of the with of mitchndria being no more than that?

Help please :biggrin:

Reply 387

DaveJ

achibachi

1) a number of different species of bacteria can cause outbreaks of food poisoning. explain how using monoclonal antobodies would enable a scientist to identify the species of bacterium involved in a particular outbreak of food poisoning.

2)the length of mitochondria can vary from 1.5 to 10 mircometers but their width never exceeds 1 micrometer.explain the advantage of the with of mitchndria being no more than that?

Help please :biggrin:

Should say "width" just in case it confuses someone, but yeah, that question baffled me too.

Could be something to do with surface area, but I'm not really sure at all. Like, maybe, it means there can be lots of small mitchondria rather than few large ones, thus meaning the many small ones have a greater surface area of cristae, allowing more respiration.

Pretty sure that's wrong though. :p:

Reply 388

SS92

yo what do you think the grade boundaries gona be like considering the fact that its the first paper for the spec?

Reply 389

Ezraeil

15

SS92

yo what do you think the grade boundaries gona be like considering the fact that its the first paper for the spec?

They may be considerably lower...my teacher told me that the first batch of students who does a new specification usually comes out best...mainly due to the lowered boundaries

Reply 390

partysunil

they are going to be between 39 and 44 out of 60 for an A. Very vague, but AQA don't really know considering it's the first time of the new specificatin, and also we have had no past papers = unfair disadvantage = automatic minimum scaling of UMS up.

also veeza vee someone saying it has the years on it.. i looked at that, and some of the questions aren't even in those years' papers!!

methinks nelson thornes are pulling a fast one by making us pay to see the answers to their questions!!!!

Reply 391

Ezraeil

15

DaveJ

Should say "width" just in case it confuses someone, but yeah, that question baffled me too.

Could be something to do with surface area, but I'm not really sure at all. Like, maybe, it means there can be lots of small mitchondria rather than few large ones, thus meaning the many small ones have a greater surface area of cristae, allowing more respiration.

Pretty sure that's wrong though. :p:

Nah I think your answer sounds just about right...its a similar principle to villi and microvilli isn't it?Having smaller structures means more of them can be fitted into a certain space,maximising surface area.

Reply 392

PhyMath

1

The first thing my biology teacher did was say "Our textbook amkers are stingy, but I've written you model answers instead of paying for them"

Reply 393

overclocked

12

achibachi

1) a number of different species of bacteria can cause outbreaks of food poisoning. explain how using monoclonal antobodies would enable a scientist to identify the species of bacterium involved in a particular outbreak of food poisoning.

2)the length of mitochondria can vary from 1.5 to 10 mircometers but their width never exceeds 1 micrometer.explain the advantage of the with of mitchndria being no more than that?

Help please :biggrin:

Mitochondria have a width that never exceeds 1 micrometer so they can keep a short diffusion pathway :smile:

Reply 394

Ezraeil

15

bob9001

Mitochondria have a width that never exceeds 1 micrometer so they can keep a short diffusion pathway :smile:

Wouldn't that be membranal thickness rather than overall width which would reduce diffusion pathway though?Just wondering,do correct me if I'm mistaken :smile:

Reply 395

overclocked

12

SyedT

Wouldn't that be membranal thickness rather than overall width which would reduce diffusion pathway though?Just wondering,do correct me if I'm mistaken :smile:

I'm not sure, but we had that question in our mock made by the school and that was the answer our teacher gave us.

Reply 396

Ezraeil

15

bob9001

I'm not sure, but we had that question in our mock made by the school and that was the answer our teacher gave us.

Oh right...I guess that must have something to do with it then :confused:

Reply 397

DaveJ

bob9001

I'm not sure, but we had that question in our mock made by the school and that was the answer our teacher gave us.

Hmm fair enough. That seems quite bizarre though, we've never learnt of anything diffusing through mitochondia.

Reply 398

Ezraeil

15

DaveJ

Hmm fair enough. That seems quite bizarre though, we've never learnt of anything diffusing through mitochondia.

Yeah same here...We just learnt their structure and their function. I guess if you made the point about surface area,that'd be mainly using common sense...? :confused:

Reply 399

DaveJ

SyedT

Yeah same here...We just learnt their structure and their function. I guess if you made the point about surface area,that'd be mainly using common sense...? :confused:

Yeah but a fair few bio answers are common sense. I think surface area seems more logical than short diffusion pathway, but I dunno...

AQA A/S Biology - Biology and Disease (BIOL1)

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