Join TSR now and get all your revision questions answeredSign up now
    Offline

    14
    ReputationRep:
    (Original post by Rubyturner94)
    nerves are starting to kick in

    Posted from TSR Mobile
    what questions u r expecting to come ...?
    Offline

    0
    ReputationRep:
    (Original post by Daniel Atieh)
    what questions u r expecting to come ...?
    human fertilisation, zoos, alot of hsw question. antimicrobial property practicle :/
    you?
    Posted from TSR Mobile
    Offline

    2
    ReputationRep:
    (Original post by Daniel Atieh)
    Attachment 221757Calculate the percentage of the cell cycle time spent in G1
    + i want u to explain to me the graph FULLY!! which is S phase, which is which .....like everything in the graph pleasee!:cry::cry:
    think about the phases and what happens, in order:

    G1
    S- synthesis of chromosomes
    G2
    Interphase
    Prophase
    Metaphase
    Anaphase
    Telophase
    Cytokenesis

    during S, the mass of DNA doubles, so you know G1 should be the flat lines before all the increases in the graph.. as no DNA changes occur during G1
    Offline

    0
    ReputationRep:
    (Original post by Rubyturner94)
    human fertilisation, zoos, alot of hsw question. antimicrobial property practicle :/
    you?
    Posted from TSR Mobile
    antimicrobial came up in jan 2013, i think the possible practicals are totipotency and root tip squash
    Offline

    0
    ReputationRep:
    (Original post by edex123)
    antimicrobial came up in jan 2013, i think the possible practicals are totipotency and root tip squash
    but they didnt ask how to carry out the investigation.

    Posted from TSR Mobile
    Offline

    2
    ReputationRep:
    I reckon zoos will come up, possibly seed banks, quite possibly Golgi transport, as well as fertilisation, but it is almost impossible to predict practicals that will come up. I actually reckon that there will be a low HSW emphasis, and more content, because January had a lot of HSW and June exams of unit 2 tend to be more content-based from looking at past papers.
    Offline

    2
    ReputationRep:
    (Original post by billyfisher100)
    I reckon zoos will come up, possibly seed banks, quite possibly Golgi transport, as well as fertilisation, but it is almost impossible to predict practicals that will come up. I actually reckon that there will be a low HSW emphasis, and more content, because January had a lot of HSW and June exams of unit 2 tend to be more content-based from looking at past papers.
    I hope you're right because the HSW are the most annoying parts of this biology course I think
    Offline

    2
    ReputationRep:
    (Original post by billyfisher100)
    I reckon zoos will come up, possibly seed banks, quite possibly Golgi transport, as well as fertilisation, but it is almost impossible to predict practicals that will come up. I actually reckon that there will be a low HSW emphasis, and more content, because January had a lot of HSW and June exams of unit 2 tend to be more content-based from looking at past papers.
    Hope it's not plant fertilisation.

    Guys can someone give me a 4/5 mark bulletpointed answer for briefly outlining plant fertilisation?

    All I seem to understand is, that the pollen tube grows down the style to the egg. There is double fertilisation, one male gamete fuses with a polar nuclei and the other one with just one egg.

    My questions for plant fert are

    1. Does the pollen grain burst open and have the pollen tube grow out of it?
    2. When are digestive enzymes released and from where?


    Can someone just give me a clear 4/5 mark answer in correct order and steps




    Posted from TSR Mobile
    Offline

    2
    ReputationRep:
    (Original post by Rubyturner94)
    cutting root tip- could cut and harm self-cut downwards on a tile when cutting the root tip
    acid-could hurt/damage eyes-corrosive- wear goggles
    cant think of anymore :/
    Posted from TSR Mobile
    Is staining your clothes a safety risk haha??

    Just wondering





    Posted from TSR Mobile
    Offline

    2
    ReputationRep:
    Can someone help me with this question (jan 2010 question 3 c)

    -Describe how you could use a plant tissue culture technique to show which of the two tissues is totipotent. (You have two tissues: A and B)

    Mark scheme:

    1. ref to {sample / explants} from both (tissues): what are explants?

    2. ref to aseptic conditions / named example ; would covering the tubes with cling film and not opening them again be okay here?

    3. grow cells into a callus / eq ; what is a callus?

    4. ref to growth regulators / eq ; what are these?


    5. ref to {cells / tissue} can differentiate / cells can
    become {whole plants / eq} ;

    6. ref to details of procedure e.g. agar / leave
    for a suitable length of time / suitable
    controlled variable ;

    please help me with those four points up there !
    Offline

    0
    ReputationRep:
    (Original post by The Assassin)
    I know - I made the updated version on the next page
    Where's the updated version ?
    Offline

    0
    ReputationRep:
    (Original post by CelloForLife)
    Where's the updated version ?
    Page 4 for the updated version
    Offline

    14
    ReputationRep:
    (Original post by Tha Realest)
    Page 4 for the updated version
    and tell us also ur expectations!!
    Offline

    14
    ReputationRep:
    I thnk there will be lots of topic 3 questions .... new questions can be like:
    What happens in interphase/g1 phase/g2 phase...
    What is conservation?
    What is cytokinesis?
    mmmm mitosis vs meiosis
    structure of mitochondria
    zoos/seed bank like for sure
    evolution and natural selection
    define endemic species/ecosystem/habitat
    how to measure biodiversity/its importance n tht stuff
    not sure abt stem cells
    a question like: how to overcome a problem: introduce a predator....



    ADD MORE ...
    Offline

    0
    ReputationRep:
    (Original post by Daniel Atieh)
    I thnk there will be lots of topic 3 questions .... new questions can be like:
    What happens in interphase/g1 phase/g2 phase...
    What is conservation?
    What is cytokinesis?
    mmmm mitosis vs meiosis
    structure of mitochondria
    zoos/seed bank like for sure
    evolution and natural selection
    define endemic species/ecosystem/habitat
    how to measure biodiversity/its importance n tht stuff
    not sure abt stem cells
    a question like: how to overcome a problem: introduce a predator....



    ADD MORE ...
    ^ I agree : I'm not really sure what to expect lol
    Offline

    0
    ReputationRep:
    (Original post by bahjat93)
    Penis
    Clit!
    Offline

    0
    ReputationRep:
    Guuuuuuys, you know the pollen grain, when it meets the style does it have two nuclei already in it? Or does it have one that undergoes mitosis to form a pollen tube nucleus and a generative nucleus which then does mitosis to form to male gametes near the ovum?

    Thanks
    Posted from TSR Mobile
    Offline

    2
    ReputationRep:
    Just did the January 2013 paper got 69/80 made so many silly mistakes hope I can get 75+ on Monday LOL


    Posted from TSR Mobile
    Offline

    2
    ReputationRep:
    (Original post by Branny101)
    Guuuuuuys, you know the pollen grain, when it meets the style does it have two nuclei already in it? Or does it have one that undergoes mitosis to form a pollen tube nucleus and a generative nucleus which then does mitosis to form to male gametes near the ovum?

    Thanks
    Posted from TSR Mobile
    You have a pollen grain and from that you get two male nuclei and then double fertilisation i think


    Posted from TSR Mobile
    Offline

    0
    ReputationRep:
    (Original post by That_Clever_Guy)
    Just did the January 2013 paper got 69/80 made so many silly mistakes hope I can get 75+ on Monday LOL


    Posted from TSR Mobile
    Well Done > Keep up the good work

    ~ Good Luck :cool:
 
 
 
Poll
Should MenACWY vaccination be compulsory at uni?

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

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