AQA Biology Unit 2 18th January
Biology exam discussion - share revision tips in preparation for GCSE, A Level and other biology exams and discuss how they went afterwards.
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Re: AQA Biology Unit 2 18th Januaryaha same situation as you i just started revising last week, i been learning about plants and fishes gas exchange.(Original post by HollyL)
The exam is on Wednesday and I'm struggling with my revision!
Any ideas on what is likely to come up?
Help would be appreciated please!
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Re: AQA Biology Unit 2 18th JanuaryUhh ohhh...(Original post by kingam)
aha same situation as you i just started revising last week, i been learning about plants and fishes gas exchange.
Well I'm resitting it as I did awful in June!
Yeah, I guess it's hard to guess what will be on the paper really -
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Re: AQA Biology Unit 2 18th JanuaryWhat'd you get?(Original post by HollyL)
Uhh ohhh...
Well I'm resitting it as I did awful in June!
Yeah, I guess it's hard to guess what will be on the paper really
I forgot most of the stuff from last year
Need to finish plant transport.
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Re: AQA Biology Unit 2 18th JanuaryMate I haven't even started yet.(Original post by HollyL)
The exam is on Wednesday and I'm struggling with my revision!
Any ideas on what is likely to come up?
Help would be appreciated please!
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Re: AQA Biology Unit 2 18th Januaryi Got a C pretty bad I haven't revised much hopefully will be easier paper than june(Original post by HollyL)
Uhh ohhh...
Well I'm resitting it as I did awful in June!
Yeah, I guess it's hard to guess what will be on the paper really -
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Re: AQA Biology Unit 2 18th JanuaryI got an E. I was horrified!(Original post by ??????????????????)
What'd you get?
I forgot most of the stuff from last year Need to finish plant transport.
I've just done that.. the transpiration? -
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Re: AQA Biology Unit 2 18th JanuaryDitto!(Original post by .Missy)
I seem to be doing terribly in past papers.. and I still dont understand tissue fluid or plants Its a resit aswell
Does anyone know how to work ou the Mass of DNA/arbitrary units?
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Re: AQA Biology Unit 2 18th JanuaryAre you referring to that question that came up in the June 2009 paper or something? If so, I can explain it
I'm comfortable with the majority of except Cell Cycle so need to go over that tonight and do some exam practice. -
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Re: AQA Biology Unit 2 18th JanuaryYeah I don't get it either surely if the number of chromosomes were the same the mass would be the same.(Original post by LifeIsGood)
Are you referring to that question that came up in the June 2009 paper or something? If so, I can explain it
I'm comfortable with the majority of except Cell Cycle so need to go over that tonight and do some exam practice. -
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Re: AQA Biology Unit 2 18th January(Original post by Besakt)
Yeah I don't get it either surely if the number of chromosomes were the same the mass would be the same.
Ok look at this question, first fill in the sperm cell - which is half the chromosomes as it is a gamete. If it has half the chromosomes, it will have 1/4 of the mass of DNA. I'll explain this after I'm finished with the Telophase bit.
Look back at the concept of mitosis...what is it? It's the cell division which produces TWO IDENTICAL cells as the SAME number of CHROMOSOMES. So the chromosome number is 26. BUT the mass of the DNA halves as that one parent cell (at stage of prophase) splits equally into TWO so it halves.
Going back to the mass of the DNA of the sperm cell, the telophase is talking about TWO cells. The sperm cell only comes from ONE of those TWO cells so the mass of DNA also is halved again from the telophase one.
Hopefully that helps
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Re: AQA Biology Unit 2 18th JanuaryDoes that mean if a cell keeps reproducing via mitosis it will eventually have pretty much no mass? Or does the mass tart to increase when it enters the interphase stage.(Original post by LifeIsGood)
Ok look at this question, first fill in the sperm cell - which is half the chromosomes as it is a gamete. If it has half the chromosomes, it will have 1/4 of the mass of DNA. I'll explain this after I'm finished with the Telophase bit.
Look back at the concept of mitosis...what is it? It's the cell division which produces TWO IDENTICAL cells as the SAME number of CHROMOSOMES. So the chromosome number is 26. BUT the mass of the DNA halves as that one parent cell (at stage of prophase) splits equally into TWO so it halves.
Going back to the mass of the DNA of the sperm cell, the telophase is talking about TWO cells. The sperm cell only comes from ONE of those TWO cells so the mass of DNA also is halved again from the telophase one.
Hopefully that helps
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Re: AQA Biology Unit 2 18th JanuaryI think that goes into too much detail, they are simply asking if you understand how the concept 'works'.(Original post by Besakt)
Does that mean if a cell keeps reproducing via mitosis it will eventually have pretty much no mass? Or does the mass tart to increase when it enters the interphase stage.
Did my explanation help you though?
