Hey there! Sign in to join this conversationNew here? Join for free
    • Political Ambassador
    • Welcome Squad
    Offline

    2
    ReputationRep:
    Political Ambassador
    Welcome Squad
    (Original post by gcsekid)
    No I mean water, because water is released from hydrolysis of trigylcerides. In a triglyceride theres already three fatty acids so they would have no net change after being hydrolysed coz theres atill only three. However there is addition of water which is only present after hydrolysis
    Quoting Collins Student Support Materials for AQA AS Biology Unit 1: Biology and Disease- p.19 Examiners' Notes Remember that fatty acids really are acidic and will therefore cause a lowering in pH when they are released during digestion (hydrolysis).
    Offline

    1
    ReputationRep:
    (Original post by studynerd4)
    I put this
    same sxc
    Offline

    19
    ReputationRep:
    Only about 10 students sat this resit exam at my school.

    It was quite a weird paper, I thought.

    Quite liked the last two 5 markers.

    Didn't like the Ebola stuff.

    PH stuff was a bit strange.

    I'd also agree with the user who said it was a better paper than last year's though. Hmm..
    Offline

    2
    ReputationRep:
    (Original post by CourtlyCanter)
    Quoting Collins Student Support Materials for AQA AS Biology Unit 1: Biology and Disease- p.19 Examiners' Notes Remember that fatty acids really are acidic and will therefore cause a lowering in pH when they are released during digestion (hydrolysis).
    Oh ****
    Please AQA dont check Collins
    Hopefully they give the OR option too so were both happy
    Offline

    1
    ReputationRep:
    (Original post by CourtlyCanter)
    Quoting Collins Student Support Materials for AQA AS Biology Unit 1: Biology and Disease- p.19 Examiners' Notes Remember that fatty acids really are acidic and will therefore cause a lowering in pH when they are released during digestion (hydrolysis).
    get in!!!!!!
    oooooooh yaaaaaaa beybeh
    1 mark in the bag
    shabang
    Offline

    3
    ReputationRep:
    On the last question I talked about how oxygen is a small, fat soluble, uncharged molecule that can pass through the fluidity if the phosphlipid bilayer
    I put that the chloride ions are charged, water soluble and large therefore cannot diffuse through the membrane
    I talked about facilitated diffusion with carrier proteins and diffusion with water filled protein channels
    Do you think this is okay for all 5 marks?
    I didn't like the paper. I enjoyed doing past papers for BIOL1 and this caught me off guard.

    NK
    Offline

    1
    ReputationRep:
    for the one about 'why did ph level stay constant?' couldn't you say all the lactose had been hydrolysed?
    Offline

    2
    ReputationRep:
    (Original post by NK18444)
    On the last question I talked about how oxygen is a small, fat soluble, uncharged molecule that can pass through the fluidity if the phosphlipid bilayer
    I put that the chloride ions are charged, water soluble and large therefore cannot diffuse through the membrane
    I talked about facilitated diffusion with carrier proteins and diffusion with water filled protein channels

    Do you think this is okay for all 5 marks?
    I didn't like the paper. I enjoyed doing past papers for BIOL1 and this caught me off guard.

    NK
    Heres how I would break down the 5 marks
    Oxygen crosses membrane via simple diffusion
    Oxygen is lipid soluble
    Chlorine ions too large to cross membrane
    So use channel protein in the phospholipid bilayer
    For facillitated diffusion
    Down a concentration gradient
    • Political Ambassador
    • Welcome Squad
    Offline

    2
    ReputationRep:
    Political Ambassador
    Welcome Squad
    (Original post by gcsekid)
    Oh ****
    Please AQA dont check Collins
    Hopefully they give the OR option too so were both happy
    Mate the revision guide itself advertises this on its front cover- 'Checked by an AQA Principal Examiner'

    Hope we both get the marks.
    Offline

    1
    ReputationRep:
    (Original post by gcsekid)
    Heres how I would break down the 5 marks
    Oxygen crosses membrane via simple diffusion
    Oxygen is lipid soluble
    Chlorine ions too large to cross membrane
    So use channel protein in the phospholipid bilayer
    For facillitated diffusion
    Down a concentration gradient
    and the polarity BS
    AQA can fok their nan
    Offline

    3
    ReputationRep:
    (Original post by gcsekid)
    Heres how I would break down the 5 marks
    Oxygen crosses membrane via simple diffusion
    Oxygen is lipid soluble
    Chlorine ions too large to cross membrane
    So use channel protein in the phospholipid bilayer
    For facillitated diffusion
    Down a concentration gradient
    yes I wrote all of that and described both facillitated diffusion with carriers proteiins and water filled channels
    Offline

    2
    ReputationRep:
    (Original post by NK18444)
    yes I wrote all of that and described both facillitated diffusion with carriers proteiins and water filled channels
    Trusting AQA and the fact that I memeorised mark scheme answer (Sad I know) they give basic marks for 2 words and u dont wana miss it out. There will be about 7-8 points and 5 of em shud give u marks
    Offline

    1
    ReputationRep:
    (Original post by chiwah)
    same here! - it messes up the ionic bonding and changes tertiary structure
    surely if the enzyme was denatured, the amino acids would be released and since amino acids have a carboxyl group it would make it more acidic n lower the ph?

    I put that all the substrate was used up
    Offline

    1
    ReputationRep:
    (Original post by Bennyab)
    Should not be fed foods high in sugar or drinks high in sugar, would affect results

    Add lactase to hydrolyse lactose or heat (I out both)
    for what they shouldn't eat i put foods containing lactose (e.g. dairy products), since they were measuring the symptoms of lactose intolerance remember other sugars would not effect the results and cause symptoms? not sure tho
    Offline

    0
    ReputationRep:
    What did everyone get for the actual size of the mitochondria ??
    Offline

    2
    ReputationRep:
    (Original post by yourmatej)
    for the one about 'why did ph level stay constant?' couldn't you say all the lactose had been hydrolysed?
    Triglycerides were being hydrolysed, not lactose


    Posted from TSR Mobile
    Offline

    1
    ReputationRep:
    (Original post by georgestonham1)
    What did everyone get for the actual size of the mitochondria ??
    2.8um
    Offline

    2
    ReputationRep:
    (Original post by georgestonham1)
    What did everyone get for the actual size of the mitochondria ??
    2.8


    Posted from TSR Mobile
    Offline

    1
    ReputationRep:
    (Original post by Bennyab)
    Triglycerides were being hydrolysed, not lactose


    Posted from TSR Mobile
    yeah thats what i meant. would that be right baby?
    Offline

    0
    ReputationRep:
    Why would the enzyme denature it was at 20 degrees? So it wouldn't denature..
    Triglycerides limiting factor more correct

    I put same as gcse kid
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    Has a teacher ever helped you cheat?
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • 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

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