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AQA Additional Science Biology exam tomorrow

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Wow, thanks! I was just worrying because different people were telling me different things which weren't correct. But thanks for this list :smile:

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 is ethanol.

•

The ethanol can be extracted by distillation.

•

The ethanol can be used to make fuels.

(edited 11 years ago)

Reply 21

username321708

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.

+rep! You beat me to it, but yes, perfectly spot-on. I was going to post the same thing. :wink:

Reply 22

usycool1

Original post by 21stcenturyphantom

+rep! You beat me to it, but yes, perfectly spot-on. I was going to post the same thing. :wink:

Thanks

I'll + rep you too when I have some left :wink:

Reply 23

thisisjokes

Good luck everyone!
I sat B2 last year; I have B3 tomorrow :smile:

Reply 24

username321708

Original post by usycool1

[*]The products of this anaerobic fermentation are ethanol and water.

Actually, sorry, I don't mean to be picky here, but during anaerobic respiration aren't the products ethanol and carbon dioxide? During aerobic yeast produces water and carbon dioxide. During anaerobic there is no water produced. It is ethanol and carbon dioxide.

Reply 25

Jarred Kyle

I've spent the best part of the weekend revising for the B3 exam, I had done minimal revision prior to Saturday so had started panicking as I have no natural ability in Biology.

Before revision I decided to do one past paper to see my ability, got a low C grade. I then wrote out 20 pages of key notes through reading the textbook and then printed off two more past papers... Got decent A*'s on both. If only I discovered the benefit of revision at the beginning of my GCSE's... :tongue:

Good luck to all in the exam.

Reply 26

Dandaman9999

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.

Thank you very much :smile:

I think that's exactly what the mark scheme says too!

Reply 27

Dandaman9999

Original post by 21stcenturyphantom

Actually, I agree here! It is CO₂ and ethanol

Reply 28

usycool1

Original post by 21stcenturyphantom

Original post by Dandaman9999

Actually, I agree here! It is CO₂ and ethanol

When glucose is present, water is produced I think :smile:

But I think the water is produced before the anaerobic fermentation or something like that. It's because of the process of glycolysis or something like that, I think :smile:

I'll try and look through my notes to explain it :smile:

Reply 29

x-Sophie-x

Not looking forward to tomorrow's exam! :s-smilie:

Reply 30

usycool1

Original post by Dandaman9999

Thank you very much :smile:

I think that's exactly what the mark scheme says too!

Original post by 21stcenturyphantom

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:

Reply 31

usycool1

Original post by x-Sophie-x

Not looking forward to tomorrow's exam! :s-smilie:

Which ones are you doing? :smile:

Reply 32

x-Sophie-x

Original post by Dandaman9999

Wow, thanks! I was just worrying because different people were telling me different things which weren't correct. But thanks for this list :smile:

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

Reply 33

x-Sophie-x

Original post by usycool1

Which ones are you doing? :smile:

I'm doing B2, B3 and Spanish :/ You?

Oh and btw, Good luck everyone! :biggrin:

Reply 34

usycool1

Original post by x-Sophie-x

I'm doing B2, B3 and Spanish :/ You?

Oh and btw, Good luck everyone! :biggrin:

I just have B3 :smile:

Good luck

Reply 35

x-Sophie-x

Original post by usycool1

I just have B3 :smile:

Good luck

Lucky you! I've done too much cramming today, woops :s

Thanks, I'll be needing it :]

Reply 36

cuckoo99

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

Reply 37

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 =]

Reply 38

username321708

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:

OK not to worry, that was interesting to read anyway :biggrin:

Reply 39

usycool1

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 =]

It varies

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