Results are out! Find what you need...fast. Get quick advice or join the chat
Hey! Sign in to get help with your study questionsNew here? Join for free to post

AQA Biology Unit 2 18th January

Announcements Posted on
Will you get the grades you need for uni? Get prepared today and de-stress, sign up to email alerts for course places! 02-06-2015
Waiting on IB results? Our IB results hub explains everything you need to know 01-06-2015
  1. Offline

    ReputationRep:
    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!
  2. Offline

    ReputationRep:
    (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!
    aha same situation as you i just started revising last week, i been learning about plants and fishes gas exchange.
  3. Offline

    ReputationRep:
    I really hated the jan 2011 paper, it was horrid!
    I scored well in the other but this one really killed me!
  4. Offline

    ReputationRep:
    (Original post by kingam)
    aha same situation as you i just started revising last week, i been learning about plants and fishes gas exchange.
    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
  5. Offline

    ReputationRep:
    (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
    What'd you get?
    I forgot most of the stuff from last year Need to finish plant transport.
  6. Offline

    ReputationRep:
    (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!
    Mate I haven't even started yet.
  7. Offline

    ReputationRep:
    (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 Got a C pretty bad I haven't revised much hopefully will be easier paper than june
  8. Offline

    ReputationRep:
    Usually when the exam is hard the lower the grade boundaries, between 70%-62% needed for an A.
  9. Offline

    ReputationRep:
    (Original post by ??????????????????)
    What'd you get?
    I forgot most of the stuff from last year Need to finish plant transport.
    I got an E. I was horrified!
    I've just done that.. the transpiration?
  10. Offline

    ReputationRep:
    Any notes peeps can share?
  11. Offline

    ReputationRep:
    How is revision going.
  12. Offline

    ReputationRep:
    I seem to be doing terribly in past papers.. and I still dont understand tissue fluid or plants Its a resit aswell
  13. Offline

    ReputationRep:
    (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
    Ditto!

    Does anyone know how to work ou the Mass of DNA/arbitrary units? :confused:
  14. Offline

    ReputationRep:
    Even AQA are not consistent with their mark schemes. FML.
  15. Online

    ReputationRep:
    (Original post by Master.K)
    Ditto!

    Does anyone know how to work ou the Mass of DNA/arbitrary units? :confused:
    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.
  16. Offline

    ReputationRep:
    (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.
    Yeah I don't get it either surely if the number of chromosomes were the same the mass would be the same.
  17. Online

    ReputationRep:
    (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
  18. Online

    ReputationRep:
    Need to do the January 2011 past paper and make sure I can work on my mistakes, looks like the hardest paper so far :/
  19. Offline

    ReputationRep:
    (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
    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.
  20. Online

    ReputationRep:
    (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.
    I think that goes into too much detail, they are simply asking if you understand how the concept 'works'.

    Did my explanation help you though?

Reply

Submit reply

Register

Thanks for posting! You just need to create an account in order to submit the post
  1. this can't be left blank
    that username has been taken, please choose another Forgotten your password?
  2. this can't be left blank
    this email is already registered. Forgotten your password?
  3. this can't be left blank

    6 characters or longer with both numbers and letters is safer

  4. this can't be left empty
    your full birthday is required
  1. By joining you agree to our Ts and Cs, privacy policy and site rules

  2. Slide to join now Processing…

Updated: April 18, 2012
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

New on TSR

Improving your uni offer

Why now is the time to think about Adjustment

x

Think you'll be in clearing or adjustment?

Hear direct from unis that want to talk to you

Get email alerts for university course places that match your subjects and grades. Just let us know what you're studying.

Quick reply
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.