OCR Biology F214 Communication, Homeostasis and Energy Friday 22 June 2012


    Rep:
    hi! the link on the first page for past papers doesnt seem to be working, has anyone got any links to past papers especially the 2012 jan one? alsooo does anyone know which of the old 280?? relates to F214 and F215?
    thankss

    Rep:
    (Original post by Huffers)
    hi! the link on the first page for past papers doesnt seem to be working, has anyone got any links to past papers especially the 2012 jan one? alsooo does anyone know which of the old 280?? relates to F214 and F215?
    thankss
    Here they are:
  1. File Type: pdf F214-01Jan12.pdf (896.3 , )
  2. File Type: pdf F214_MS_Jan12.pdf (169.2 , )

    Rep:
    (Original post by Princess Kawaii)
    Here they are:
    shall we revise?

    Rep:
    (Original post by otrivine)
    shall we revise?
    Yeh Okay...this unit or f215?

    Rep:
    (Original post by Princess Kawaii)
    Yeh Okay...this unit or f215?
    mixture if you want chapter 1 in f214 and f215 tomorrow starting chapter 2

    Rep:
    (Original post by otrivine)
    mixture if you want chapter 1 in f214 and f215 tomorrow starting chapter 2
    Cool. We'll take it in turns to ask and answer.

    Define homeostasis.

    Rep:
    (Original post by Princess Kawaii)
    Cool. We'll take it in turns to ask and answer.

    Define homeostasis.
    yes
    Homoeostasis is the maintenance of internal environment in a constant sate despite any changes on external environment such as regulation of temperature in body.

    How can sicle cell anaemia be treated and which amino acid does sicle cell anemia replace (2)

    Rep:
    Yep that correct

    Glutamic acide is replaced with valine
    Im taking a guess on how its treated by somatic therapy/or a mutation?

    What is the function of the repressor protein?

    Rep:
    (Original post by Princess Kawaii)
    Yep that correct

    Glutamic acide is replaced with valine
    Im taking a guess on how its treated by somatic therapy/or a mutation?

    What is the function of the repressor protein?
    hmm correct but no to treat it use do blood transfusion this was in the stretch and challenge part ,

    repressor protein binds to the operator region (binding with repressor molecule)

    Rep:
    (Original post by otrivine)
    hmm correct but no to treat it use do blood transfusion this was in the stretch and challenge part ,

    repressor protein binds to the operator region (binding with repressor molecule)
    Yeh thats right...need to add that when it binds to the operator region it also blocks the promoter region stopping RNA polymerase from transcribing the genes for Z & Y.

    I've got problems with my internet so I'll be back later on. We'll carry on revising then.

    Rep:
    (Original post by Princess Kawaii)
    Yeh thats right...need to add that when it binds to the operator region it also blocks the promoter region stopping RNA polymerase from transcribing the genes for Z & Y.

    I've got problems with my internet so I'll be back later on. We'll carry on revising then.
    ok but please princess kawaii come back soon and when you give the question indicate the number of marks so i know how much to write
    talk to you later

    Rep:
    does anyone have the synoptic links for this paper?

    Rep:
    so some explain local current to me????

    Be ever so helpfu

    Rep:
    (Original post by hudhud123)
    so some explain local current to me????

    Be ever so helpfu
    local current
    sodium ion channels open which causes sodium ions to diffuse from a region of high concentration outside the neurone to a region of lower concentration in neurone. Also, sodium ions diffuse sideways from high conc. to low. con and the movement of charged particles causes local current

    these are the key points for getting the mark if i made a mistake somewhere please add or change thanks

    Rep:
    Anyone have a list of all the definitions we NEED to know please?

    (Original post by Princess Kawaii)
    Here they are:
    Thank you very much! Time to compile my predictions of what's going to come up. It's already quite clear on F215 what hasn't come up whatsoever. :sexface:

    Rep:
    (Original post by Groat)
    Thank you very much! Time to compile my predictions of what's going to come up. It's already quite clear on F215 what hasn't come up whatsoever. :sexface:
    really what do u think they will ask about F215?

    Rep:
    (Original post by otrivine)
    really what do u think they will ask about F215?
    this is the f214 thread.

    Rep:
    Does anyone want to ask and answer each others questions with me?

    Rep:
    (Original post by rf229)
    Does anyone want to ask and answer each others questions with me?
    sure
    define homeostasis and give example of negative feedback(5)

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