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    Can someone explain the electron transport chain / chemiosmosis / oxidative phosphorylation
    Thank you!
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    (Original post by domcandrews)
    Looooooooooool i'm done
    hahahaha lool do u have skype
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    (Original post by EspDe97)
    Good luck everyone with the exam tomorrow! Just to check (I always worry I'm going to miss an exam and check multiple times haha), the exam is in the afternoon isn't it?
    Aha no harm in making sure! Yeah it's in the afternoon. Good luck to you too
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    Good luck to everyone!!
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    (Original post by hajs)
    After a prolonged period of fasting, glycogen levels in the liver are depleted. However the liver can still produce glucose by the process of gluconeogenesis. Describe one way in which this is done?

    Anyone gonna try to answer that? I found it really difficult lol..
    It would be the respiration of fatty acids
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    Can someone tell me what's the best way to revise evidence of chemi-osmosis and what's the besst way to deal with them in the exam?
    Do we need to know this???? Word for word??
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    Synoptic Element for f214

    Fibrous Proteins: tough and rope shaped. found in connective tissues.

    Globular Proteins: round and compact. soluble, easily transported in fluids.

    monosaccharides- glucose, monosaccharides joined by glycosidic bonds.

    starch- energy strach maerial in plants
    amylose- long unbranced chain of alpha glucose
    amylopecin- long branched chain of alpha glucose

    glycogen- main energy storage material in animals. polysaccharide. loads of side brances meaning
    glucose can be released quickly. compact-good for storage.

    celllulose- long unbranched chain, provides sructural suppport.

    to find out if a substance conains proteins, use the biuret test
    soluion should be alkaline so add sodium hydroxide solution
    add copper sulfate solution
    if protein is present, the solutio turns purple, if not it stays blue

    benedicts test for sugars

    iodine test for starch

    emulsion test for lipids

    emphysema- chronic lung disease involving breakdown of alveoli

    This list is not exhaustive, but a few topics that may appear briefly, Good luck everyone.

    Topics that are likely to appear:
    1. Photosynthesis/ respiration (appears every year)
    2. lungs or kidneys (sometimes both)
    3. endotherms/ ectotherms/ body mechanisms
    4.adrenaline/ control of heart rate
    5. ADH
    6. positive/negative feedback mechanism
    7.control of heart rate.
    8. deecting hormones/ HCG
    9. Adaptation of mitochondrion/chloroplast
    10. Limiting factors in relation to calvin cycle
    11. Respiraion experiment

    Once again this list is no exhaustive, but these topics have appeared the least in recent years, although the same topics could appear so revise everyhing!
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    (Original post by domcandrews)
    Looooooooooool i'm done
    F215 stands for unit 5 and the exam is on the 17th June. Tomorrows exam is f214 unit 4. Try to do some unit 4 past papers now


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    (Original post by DaveUncle)
    Anyone tell me how PCR works???

    Wrong thread
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    (Original post by nk96)
    Aha no harm in making sure! Yeah it's in the afternoon. Good luck to you too
    Thank you! I'm glad it's in the afternoon, I'll have time to go over the key content again tomorrow haha
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    Does TP produce fatty acids and amino acids or glycerate 3 phosphate ??


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    (Original post by TheLegalDealer)
    from 0-1 seconds the neurone is at resting potential where 3 Na+ ions are actively transported out of the cell using sodium-potassium ion pumps for every 2K+ ions in . However membrane is more permeable to K+ ions so K+ essentially leak out , so there are more positive ions outside compared to inside so P.D = -70mv

    If the P.D. doesn't exceed -55mv (threshold value ) and A.P. will not occur this is the all or nothing law

    At 1 second a stimulus causes Na+channels to open ,so Na+ ions flow into the cell leading depolarisation where P.D. = +40mv

    At 2 seconds , the Na+ channels close and K+ channels open

    After this K+ flows out of the cell as their is a very high conc. gradient this leads to repolarisation .

    However K+ "overshoot" so P.D. = -75mv leading to hyper-polarisation

    Now the refractory period occurs where resting potential is being reestablished and Na+ channels are closed therefore no A.P. cannot occur in this period until resting potential is restored


    Hope that helps
    It did! Thank you so much!!
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    has the paper been leaked
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    (Original post by TheLegalDealer)
    Only the basement membrane as it has a fine mesh of collagen fibres that don't allow large molecules e.g. proteins through . The fenestrations (holes) in the capillary wall allow all solutes to pass through except proteins
    Large molecules such as large proteins cannot leave the blood filtrate through the endothelium pores but erythrocytes (RBCs) can and are prevented from entering the bowmans capsule by the basement membrane, just did June 2013 paper question 3a basically on what can enter and where ect.
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    (Original post by AsianBeauty)
    Does TP produce fatty acids and amino acids or glycerate 3 phosphate ??


    Posted from TSR Mobile
    GP produces fatty acids and amino acids. TP produced hexose sugars and glycerol and then obviously RuBP
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    predictions anyone?
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    (Original post by games211)
    hahahaha lool do u have skype
    Only on my computer, which is broken atm, using ipad atm
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    (Original post by EspDe97)
    Thank you! I'm glad it's in the afternoon, I'll have time to go over the key content again tomorrow haha
    I'm going to do the same thing haha. I can't wait for this stupid exam to be over!


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    (Original post by AsianBeauty)
    Does TP produce fatty acids and amino acids or glycerate 3 phosphate ??


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    Triose phosphate does (tp) gp is what it's derived from when it is oxidised and ATP is added it makes tp hope that helps
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    (Original post by grahamknight)
    has the paper been leaked
    *gets excited*
    *realises even if it was leaked, I'd still get half the questions wrong*
    *carries on with revision*
    *sighs*
 
 
 
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