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AQA Additional Science Biology exam tomorrow

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Reply 40

shyamshah

Got B2 tomorrow, but surprisingly I am actually quite ready for it. Bring it on!!!

Reply 41

username321708

Original post by cuckoo99

you guys are lucky you're not doing the unit 2 biology AS level exam tomorow ;p that **** is crazzzy

I'm actually really really looking forward to Science A levels. I want to know more about what goes on in pretty much every aspect of Science. GCSE is fun but also very simplified and you can tell they dub it down at this level.

Original post by Cnut

Does anyone know the grade boundaries for the exam tomorrow?
My teacher told me it was 80% for an A, but I looked online, and AQA says that an A is only 55%.

Any insight? Cheers =]

As far as I am aware the grade boundaries are adjusted according to the examination. Meaning not until all the papers marked and all candidates awarded results will they be able to determine the difficulty of the paper and be in a position where they can set grade boundaries. If I am wrong, please feel free to correct me on this. :smile:

(edited 11 years ago)

Reply 42

Cnut

Original post by usycool1

It varies

For B2 last June, you needed only 58% for an A*...

It's been quite low for a few years now. Do you think it's likely to change though?

Reply 43

Dandaman9999

Original post by usycool1

See here.

Scroll down to "The chemical process of fermentation of glucose." It's a bit complicated but I think it shows that water is produced :tongue:

I think you're right! Do we have to know this stuff, or just what you told me earlier? :s-smilie:

Reply 44

Dandaman9999

Original post by x-Sophie-x

There are many other pros and cons which are perfectly acceptable answers...

The problem was that I got to,d of many in class but they weren't answers in the AQA mark scheme, so I just wanted confirmation.

Reply 45

x-Sophie-x

Original post by Dandaman9999

The problem was that I got to,d of many in class but they weren't answers in the AQA mark scheme, so I just wanted confirmation.

This question was in the 2012 paper though so I doubt it would come up..

Reply 46

Dandaman9999

Original post by x-Sophie-x

This question was in the 2012 paper though so I doubt it would come up..

Are you sure? What do you think will come up then?

Reply 47

Stephanie8

Original post by Dandaman9999

I think you're right! Do we have to know this stuff, or just what you told me earlier? :s-smilie:

Fermentation (anerobic respiration) of glucose makes ethanol and carbon dioxide
aerobic respiration of glucose makes carbon dioxide, water and lots of energy.

Reply 48

Kitty.Cat

Original post by usycool1

No problem :smile:

Also, I should have said that another disadvantage of transplants is that the transplanted kidney only works for a few years or so :smile:

And for ethanol-based fuels:

•

Use carbohydrase enzymes to break down starch from plants into glucose.

•

Ferment the glucose anaerobically with yeast.

•

The products of this anaerobic fermentation are ethanol and water.

•

The ethanol can be extracted by distillation.

•

The ethanol can be used to make fuels.

This has helped me! Thank you

Reply 49

Kitty.Cat

Do you guys think there is a high chance of plants being on tomorrows paper since there hasn't been any on all of the other past papers?

Reply 50

Dandaman9999

Original post by Stephanie8

Fermentation (anerobic respiration) of glucose makes ethanol and carbon dioxide
aerobic respiration of glucose makes carbon dioxide, water and lots of energy.

That's what I thought but his link says differently??

Reply 51

usycool1

Original post by Stephanie8

Fermentation (anerobic respiration) of glucose makes ethanol and carbon dioxide
aerobic respiration of glucose makes carbon dioxide, water and lots of energy.

Be careful :smile:

Aerobic respiration does not make energy, it releases it :smile:

Sorry, don't mean to sound pricky :smile:

Reply 52

usycool1

Original post by Dandaman9999

That's what I thought but his link says differently??

It's complicated. This is what it says in my revision guide:

If sugar-rich products from cane and maize are fermneted anaerobically with yeast, the sugars break down incompletely to give ethanol and water.

I guess this is all we need to know :smile:

Reply 53

Dandaman9999

Original post by usycool1

Are you sure? Because my revision guide says:

"Yeast make ethanol when they break down glucose by anaerobic respiration-
Glucose-->Ethanol+Carbon Dioxide+Energy"

Reply 54

Kitty.Cat

Original post by Dandaman9999

Are you sure? Because my revision guide says:

"Yeast make ethanol when they break down glucose by anaerobic respiration-
Glucose-->Ethanol+Carbon Dioxide+Energy"

Mines says this too, and my notes off my teacher

Reply 55

REASON_Lighters

doing B2 and B3 tomorrow want to get A*'s in both. Good luck to everyone else doing them.

Reply 56

usycool1

Original post by Dandaman9999

Are you sure? Because my revision guide says:

"Yeast make ethanol when they break down glucose by anaerobic respiration-
Glucose-->Ethanol+Carbon Dioxide+Energy"

Yup

And my teacher said something about water...

I think my revision guide has worded it badly though. I think water is made before the anaerobic respiration by the process of glycolisis.

Reply 57

Dandaman9999

Original post by usycool1

Yup

And my teacher said something about water...

I think my revision guide has worded it badly though. I think water is made before the anaerobic respiration by the process of glycolisis.