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    Hey guys.

    Ok I know this is very common, and everyone feels the same but literally I am terrified for tomorrow's exam. I am not exaggerating one bit but my heart is beating extremely fast and i'm getting really bad pain around my heart area LOOL . I do the same in the exam. I panic and I try really hard to brace myself. any tips on how to stop this? I get a lot of prep talks from friends and family but I'm worried that what i've done isn't enough. omgomgomg
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    (Original post by hussaincute)
    can sombody plz answer that in simple words:

    explain why ATP production decreases when oxygen is low in the tissues?
    more anaerobic repiration which is less efficent only 2 ATP produced compared to about 32 ATP for aerobic.
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    (Original post by Brad0440)
    More unit 5 questions:

    Describe the structure of a muscle fibre. (4)
    Spoiler:
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    - Reference to multinucleated
    - Reference to {sarcolemma/sarcoplasm/sarcoplasmic reticulum}
    - Contains myofibrils
    - Myofibrils made up of {sarcomeres/contractile units}
    - Sarcomeres made up of {actin/thin filament} and {myosin/thick filament}


    Explain how plants grow towards light. (6)
    Spoiler:
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    - Idea of {auxins/IAA/eq} being distributed on the side that is not illuminated
    - Auxins {diffuse} down the coleoptile
    - {Auxins/IAA/eq} bind to receptors on the plasma membrane of the plant cells
    - Idea of the binding of the {auxins/IAA/eq} to receptors causing the the production/activation of {second messenger molecules}
    - Reference to the production of extra {enzymes/other proteins/eq}
    - Idea of the {auxins/IAA/eq} stimulating {proton pumps/eq} (to lower pH inside the cell)
    - Reference to the low pH stimulating the protein {expansin} to weaken the cell walls
    - Reference to the low pH stimulating an enzyme to break the bonds between the {microfibrils/eq} in the cell membrane
    - Idea of the movement of H+ ions causing a change in potential difference and causing the movement of water into the cell by {osmosis}
    - Reference to the cells swelling (due to water intake) and elongating them as they grow
    - Idea of the elongation of the cells causing the plant to grow towards the light


    State two consequences of exercising too little and two consequences of exercising too little. (4)
    Spoiler:
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    Maximum of two marks (exercising too little):
    - Obesity
    - Heart disease/named example
    - Stroke
    - (Type II) diabetes
    - Any other sensible consequence

    Maximum of two marks (exercising too much):
    - Wear to muscles/joints
    - Damage to the immune system/more frequent infections
    - (Chronic) fatigue
    - Any other sensible consequence
    Thx but isnt the second question too much off our spec, well yes a couple of points we should know, but isnt that a liitle too much detail
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    (Original post by Zahra333)
    Hey guys.

    Ok I know this is very common, and everyone feels the same but literally I am terrified for tomorrow's exam. I am not exaggerating one bit but my heart is beating extremely fast and i'm getting really bad pain around my heart area LOOL . I do the same in the exam. I panic and I try really hard to brace myself. any tips on how to stop this? I get a lot of prep talks from friends and family but I'm worried that what i've done isn't enough. omgomgomg
    You know the material, you've covered everything. Everything in that exam tomorrow (or 99.9% of it) you have already covered. So you know all the information, and when you read a question, that information will just start pouring out of your brain without any effort. You don't need to be worried. And if the exam is difficult, it will be difficult for everyone else too, so you won't be the only one.

    Good luck.
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    (Original post by Zahra333)
    Hey guys.

    Ok I know this is very common, and everyone feels the same but literally I am terrified for tomorrow's exam. I am not exaggerating one bit but my heart is beating extremely fast and i'm getting really bad pain around my heart area LOOL . I do the same in the exam. I panic and I try really hard to brace myself. any tips on how to stop this? I get a lot of prep talks from friends and family but I'm worried that what i've done isn't enough. omgomgomg
    It sounds like you are experiencing tachachardia lol

    Same I'm so scared ... I can't concentrate - I just keep daydreaming
    Deep breaths work for me - 5in hold 3 secs out 5 secs - try it
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    (Original post by tsr1)
    is action potential and potential difference the same thing? or action potential only occurs in at synapse? is can someone help me please thanks!
    An impulse is a wave of action potentials down an axon. Potential difference is the charge across a membrane due to the movement of ions (in this context). Basically, a change in potential difference is what causes an action potential to be generated.
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    (Original post by [email protected])
    Thx but isnt the second question too much off our spec, well yes a couple of points we should know, but isnt that a liitle too much detail
    I agree. Some people go manic on the tiniest details that aren't even mentioned in the textbook. Makes me laugh sometimes, they spent so much effort learning something they don't need to.
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    (Original post by Mjwilson1988)
    I'm taking Chem 5 on Wednesday, that one isn't as frightening as Bio 5 though!

    Also, in reply to your question, did you mean the production of Drugs by using GMOs (Plants, Microorganisms and Animals)?



    Animals:

    Genes coding for the desired protein are injected into a fertilised animal egg and this egg is implanted, so that the egg is carried to term and the animal produced has a genome coding for this protein.
    Embryo - not egg.
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    (Original post by iwantopas19)
    U asked a nice quesion related to the article, now i cant find it. can u please repost it? and did u get the answer?
    Noone replied. I asked why the cells that were altered to contain cancer-causing genes were inserted into mice that had their immune systems compromised.
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    (Original post by Ziggy_72)
    Embryo - not egg.
    Actually, i belive egg is fine since cgp book says Fertilised animal egg cell
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    I don't know why but I don't feel no fear for exams.
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    (Original post by I Hate Edexcel)
    Noone replied. I asked why the cells that were altered to contain cancer-causing genes were inserted into mice that had their immune systems compromised.
    The mice will have had their immune systems compromised because in this situation you're trying to alter the DNA of the Mouse cells using the Vector of bacteria (? I'm assuming bacteria as you say you're using cells?) or virus. These things will be recognised by the immune system as Non-Self, and this will promote an immune response, thus causing the destruction (Phagocytosis etc) of the Vector. Suppressing the immune systems makes it more likely that the Vector will infect the desired cells.
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    @Mjwilson1988

    - if you think Bio 5 is scarier than Chem 5 you need your head checked!
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    (Original post by Zahra333)
    Hey guys.

    Ok I know this is very common, and everyone feels the same but literally I am terrified for tomorrow's exam. I am not exaggerating one bit but my heart is beating extremely fast and i'm getting really bad pain around my heart area LOOL . I do the same in the exam. I panic and I try really hard to brace myself. any tips on how to stop this? I get a lot of prep talks from friends and family but I'm worried that what i've done isn't enough. omgomgomg


    lissen to opppaa gangam style
    haha, stay cool, all the best!
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    (Original post by thegreenchildren)
    Yes I saw that one and it is helpful so thank you
    However I was wondering about where the chemoreceptors are for the heart rate control and the breathing rate control :/
    Breathing rate is controlled by:

    1. Chemoreceptors in aortic and carotid bodies for low pH
    2. The cerebrum (deciding to pant or hold your breath)
    3. The stretch receptors in the lungs telling you when the are full - so stop inhaling now and let the exhale begin.
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    (Original post by Mjwilson1988)
    The mice will have had their immune systems compromised because in this situation you're trying to alter the DNA of the Mouse cells using the Vector of bacteria (? I'm assuming bacteria as you say you're using cells?) or virus. These things will be recognised by the immune system as Non-Self, and this will promote an immune response, thus causing the destruction (Phagocytosis etc) of the Vector. Suppressing the immune systems makes it more likely that the Vector will infect the desired cells.
    Out of curiousity, will that suffice a 3 marker, anything else one could add?
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    (Original post by Mjwilson1988)
    The mice will have had their immune systems compromised because in this situation you're trying to alter the DNA of the Mouse cells using the Vector of bacteria (? I'm assuming bacteria as you say you're using cells?) or virus. These things will be recognised by the immune system as Non-Self, and this will promote an immune response, thus causing the destruction (Phagocytosis etc) of the Vector. Suppressing the immune systems makes it more likely that the Vector will infect the desired cells.

    this is what i thot too.
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    (Original post by [email protected])
    Thx but isnt the second question too much off our spec, well yes a couple of points we should know, but isnt that a liitle too much detail
    Point 8 on the specification says "Compare mechanisms of coordination in plants and animals,
    ie nervous and hormonal, including the role of IAA in
    phototropism
    ". I'm not sure exactly how much detail it wants us to go into, but the official SNAB book does pretty much go into that much detail (page 215 if you have it). Although, actually it doesn't say anything about the weakening of the cell membrane and expansin, so you can ignore that mark.
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    (Original post by [email protected])
    Actually, i belive egg is fine since cgp book says Fertilised animal egg cell
    I probably should use Embryo though, it is the more scientific word. I don't know why I didn't at the time, sometimes in practice questions I write pretty decent stuff and then look at the mark scheme and realise that they give loads of marks if you just use the most scientific terminology possible. Hah, you should see my past papers, I think on every one I've written "Use more technical language!"
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    (Original post by Brad0440)
    An impulse is a wave of action potentials down an axon. Potential difference is the charge across a membrane due to the movement of ions (in this context). Basically, a change in potential difference is what causes an action potential to be generated.
    Thanks you
 
 
 
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