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AQA GCSE Biology Unit 3 - BLY3H - Monday 21st May 2012

Yo. Got the thread ready... All please feel free to post any questions/answers you can remember from the day... Thanks !! :smile:

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Reply 1
http://gcserevision101.wordpress.com/biology-b3/ - Helpful website for this topic
Reply 2
Good luck everyone :smile:
Original post by Jaykishen
Yo. Got the thread ready... All please feel free to post any questions/answers you can remember from the day... Thanks !! :smile:


Dreading this exam ><
Reply 4
DW... Trust me - Its much easier than B2.. No lie !!
Just needa learn the stuff...
Reply 5
yeah it actually is easier than b2!
Reply 6
http://store.aqa.org.uk/qual/pdf/AQA-4411-W-SP-12.PDF
The specification for Biology Unit 1, 2 and 3.
VERY useful!
Unit 3- Page 49-54.
Learning everything on there, will guarantee you an A.

I haven't even had a teacher for Unit 3, but I still managed to get an A in a mock I just completed by just revising everything from the specification :smile:

Good luck!
what time is the exam? haha so unorganised :L
Reply 8
Original post by jermainegolley
what time is the exam? haha so unorganised :L


9am, I think :wink:
Reply 9
Find biology unit 3 so hard!!
Im cramming at the moment, can't get my head round fermenters and exponential growth and stuff :confused:
Good luck everyone
Reply 10
Am I the only person who finds Unit 3 far harder than Unit 2?
I'm really confused, everywhere I go I'm getting different answers...can anyone explain to me what happens to glucose, ions and water in the body? Like, how are they absorbed into the bloodstream?

Thanks!
Reply 12
Original post by pokings
Am I the only person who finds Unit 3 far harder than Unit 2?


Unit 3 is miles harder than unit 2, unit 2 was a doodle!
Try some of the unit 3 past papers, half of them are "application of knowledge" questions which I can't stand...
Reply 13
Original post by Swords N Thorns
I'm really confused, everywhere I go I'm getting different answers...can anyone explain to me what happens to glucose, ions and water in the body? Like, how are they absorbed into the bloodstream?

Thanks!


Is this in the kidney that your asking about?? If so....
A healthy kidney:
βˆ’ first filtering the blood: urea, glucose, water, ions
βˆ’ reabsorbing all the glucose (via active transport)
βˆ’ reabsorbing the sufficient ions (via active transport)
βˆ’ reabsorbing the sufficient water (via osmosis)
βˆ’ reabsorbing NO urea

So in the urine there are excess ions, excess water and urea
Hope this helps! :smile:
Reply 14
Original post by Swords N Thorns
I'm really confused, everywhere I go I'm getting different answers...can anyone explain to me what happens to glucose, ions and water in the body? Like, how are they absorbed into the bloodstream?

Thanks!

After being filtered:

Glucose is almost completely reabsorbed by active transport from the proximal tubules.
Some Water is reabsorbed by the process of osmosis.
Some Ions are reabsorbed by active transport.
About 50% of urea is reabsorbed by passive transport (although at GCSE, I think it's OK to say that no urea is reabsorbed :smile: )
Reply 15
Good luck everybody! I think unit 3 is definetly easier than unit 2...
Reply 16
unit 2 was easy but the genetic stuff put me off
unit 3 - i need to revise glucose stuff so basically the last chapter lol
Reply 17
I find B3 pretty simple but i always forget the production of stuff using microorganisms i.e. beer, yoghurt, biogas :s-smilie:
Reply 18
I'm doing both tomorrow and i find B2 so much easier !! Well in B3 it's not the actual content that's hard but the type of questions they ask, well for me anyway. Just wondering, does anyone have the Jan 2012 papers for B2 or B3?
@James; I agree, it's the way they set the questions out.
After looking at the past papers, they grade boundaries seem quite reasonable.

Hopefully tomorrows paper is alright. I remember doing B2 In January, and it was completely How science works questions. Nothing really knowledge wise.

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