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    anyone got a link to unit 5 practise questions? (that aren't in textbook)
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    (Original post by Cpie21)
    Yep chemistry on Monday, psychology on Tuesday and then this on Wednesday!
    I've condensed my notes for action potential and all that & I'm okay with transcription/translation.
    Today I'm planning on getting muscle contraction done because our teacher didn't go through it with us any key point on that? I hate the way the textbook explain it
    I hate the way the textbook explains everything! We need to learn the structure of a muscle so the A-band, I-band, Z line, H zone and sarcomere. Then the muscle filaments myosin and actin - myosin is thick and actin which is thin. They are arranged to form a sarcomere.

    During contraction:-
    - Z lines move closer together (sarcomere shortens)
    - A band remains same size as myosin doesn't change in size.

    -T-tubules carry action potential throughout the sarcoplasm. Causes sarcoplasmic reticulum to release calcium ions (which will need to be reabsorbed by active transport) into myofibrils.
    -This causes tropomyosin to pull away from the actin filament, allowing myosin to attach and form an actin-myosin cross-bridge.
    -Myosin is able to pull actin along, using ATP and therefore producing ADP +Pi.
    - Reformation of ATP allows myosin to detach from actin and return to original position and attach to new actin filament = cycle repeats

    ** Most of this ATP comes from ADP produced during respiration of pyruvate in mitochondria - but this requires O2. Anaerobic means of producing ATP is also needed for vigorous muscle contraction = PHOSPHOCREATINE. This is stored in muscle and can supply phosphate to combine with ADP and produce ATP.

    That's how I've condensed it!
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    (Original post by Regina15)
    Don't worry, I left it later than this last year(I'm retaking) and managed to get a C just by focusing on main topics. If anything, skip DNA tech, it rarely ever comes up and if it does, there isn't much they can ask, I'd just do a quick overview. Start with action potentials and then diabetes perhaps, those are two topics I don't think came up last year(someone correct me if I'm wrong) - you could also use physicsandmathstutor.com - it's everything from the book just condensed it may be easier to work through
    Thank you!!! I'll be happy with a C, don't even need this A level to get into my first choice, but have too much prestige to let myself fail lol
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    (Original post by lucyloops1996)
    Thank you!!! I'll be happy with a C, don't even need this A level to get into my first choice, but have too much prestige to let myself fail lol
    No problem Oh right, haha, I'm like that myself good luck!
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    I need a B overall and it is looking unlikely after biol4 D:
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    (Original post by lyricallies)
    I need a B overall and it is looking unlikely after biol4 D:
    I thought Bio 4 wasn't too bad, especially those last questions!
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    (Original post by lyricallies)
    I need a B overall and it is looking unlikely after biol4 D:
    I f***** biol4 up too!
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    (Original post by djhodnett)
    I thought Bio 4 wasn't too bad, especially those last questions!
    It was the salty soil and biomass ones I think I screwed up the most :L
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    (Original post by lyricallies)
    It was the salty soil and biomass ones I think I screwed up the most :L
    oh that's barely any marks you will be fine
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    (Original post by djhodnett)
    I thought Bio 4 wasn't too bad, especially those last questions!
    Hated it at the time although retrospectively it wasn't too much harder than other papers, definitely the worst one of all the practice ones though
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    (Original post by anonlad)
    Hated it at the time although retrospectively it wasn't too much harder than other papers, definitely the worst one of all the practice ones though
    oh, i thought the grade boundaries would be higher in this one compared to last years but by peoples responses maybe not?
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    (Original post by Ozy96)
    I don't think so, if anything it might be easier. I don't think they could come up with new questions with HSW and applications in a few days. They either have a backup or took questions from past papers. Either way we can't say for sure, so revise everything!
    I heard that AQA always make back-up exams anyway just in case - so honestly I doubt we'll notice a difference.
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    (Original post by djhodnett)
    oh, i thought the grade boundaries would be higher in this one compared to last years but by peoples responses maybe not?
    I'm relying on low grade boundaries ✌️
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    (Original post by lucyloops1996)
    I hate the way the textbook explains everything! We need to learn the structure of a muscle so the A-band, I-band, Z line, H zone and sarcomere. Then the muscle filaments myosin and actin - myosin is thick and actin which is thin. They are arranged to form a sarcomere.

    During contraction:-
    - Z lines move closer together (sarcomere shortens)
    - A band remains same size as myosin doesn't change in size.

    -T-tubules carry action potential throughout the sarcoplasm. Causes sarcoplasmic reticulum to release calcium ions (which will need to be reabsorbed by active transport) into myofibrils.
    -This causes tropomyosin to pull away from the actin filament, allowing myosin to attach and form an actin-myosin cross-bridge.
    -Myosin is able to pull actin along, using ATP and therefore producing ADP +Pi.
    - Reformation of ATP allows myosin to detach from actin and return to original position and attach to new actin filament = cycle repeats

    ** Most of this ATP comes from ADP produced during respiration of pyruvate in mitochondria - but this requires O2. Anaerobic means of producing ATP is also needed for vigorous muscle contraction = PHOSPHOCREATINE. This is stored in muscle and can supply phosphate to combine with ADP and produce ATP.

    That's how I've condensed it!
    Thank you so much!! You're a life saver haha

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    saw the news about the theft, wtfff
    hope they really have backup
    i dont want no taster of the 2016 spec lol
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    (Original post by Makashima)
    saw the news about the theft, wtfff
    hope they really have backup
    i dont want no taster of the 2016 spec lol
    We've already done unit 4 though. So even if they changed the papers its not like there was a huge difference..? I really don't think they'll give us new spec questions or the fact that they'll change the rewritten paper by much - if this whole thing is actually true.

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    (Original post by MrPolish)
    Hey guys, im not sure if these were posted before, but in case they weren't here are some really useful Biol Unit 5 notes :

    https://7def787516e26c878dc93b38d6ce...%20A-Level.pdf

    hope they help
    Wow these are so so good! Thank you! Do you by any chance have notes on BIOL 1-4 as well?
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    (Original post by Cpie21)
    We've already done unit 4 though. So even if they changed the papers its not like there was a huge difference..? I really don't think they'll give us new spec questions or the fact that they'll change the rewritten paper by much - if this whole thing is actually true.

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    thing about the theft? yes it is true
    http://www.theguardian.com/education...-papers-stolen

    they must have a backup
    a complex organisation business, AQA, must be not that simple!
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    (Original post by Cpie21)
    We've already done unit 4 though. So even if they changed the papers its not like there was a huge difference..? I really don't think they'll give us new spec questions or the fact that they'll change the rewritten paper by much - if this whole thing is actually true.

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    DONT WORRY
    They WILL have backup
    since stealing papers has happened before like twice or somethinggggggg
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    predictions for essays?
 
 
 
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