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    (Original post by Quirky01)
    If temperature is greater tensile strength would be smaller. It would be easier to break/tear the fibre at higher temperature..reason is not known but could u think of one? I guess bonds holding the cells together become weaker at high temperatures
    Yeah I guess that would be the reason since the plant fibre is made of fibres that are connected by bonds so higher temperatures will cause them breaking and therefore low tensile strength


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    (Original post by user179)
    Hey I think you first have to mix your DNA sample with restriction enzyme so the DNA sample is cut into fragments. I think you add the DNA fragments to the wells, not whole DNA samples. Makes sense?
    Oh yea I totally forgot that imp. most step in here..
    Thanks for adding in! X
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    Hii! I have the philip alan student unit guide for bio 3/6 in pdf. If you want it. Pm your email to me

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    (Original post by PlayerBB)
    I guess if they would gives us gel electrophoresis, they won't include CF, they will more ask us that two people were suspects in a crime, their DNA was amplified by PCR, how will GE will show us which one of the two suspects is more likely to be the criminal, plan an investigation.......

    The dependent variable would be the size of DNA bands
    The independent variable would be DNA sample from suspect used

    But I am just guessing
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    I hope you won't be an examiner one day, you would kill us
    hahahahha don't worry i have better things to do in the future than ruin potential careers with meaningless mark schemes :P
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    (Original post by Chinu_Cheeku97)
    Hii! I have the philip alan student unit guide for bio 3/6 in pdf. If you want it. Pm your email to me

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    You already know mine! Please send me!
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    Guys! What are the questions that have chi squared test and mann whitney tests? I cant find any from edexcel apart from t-test and Spearman's Rank. Help please?
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    Has anyone sopved Jan 2016? It's like the hardest paper EVER. God I feel so demotivated now.
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    (Original post by TheMadHatteress)
    Has anyone sopved Jan 2016? It's like the hardest paper EVER. God I feel so demotivated now.
    Yeah!!!!!! It's SO FREAKING hard like the 3rd and the 2nd questions ate normal but the first was so hard
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    (Original post by PlayerBB)
    Yeah!!!!!! It's SO FREAKING hard like the 3rd and the 2nd questions ate normal but the first was so hard
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    I know right! And now i feel so demotivated after all that practicr with all those other past papers, I can't believe this
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    Does anyone know any good websites where I can go over all the statistical tests? (T-test, Chi-square)


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    (Original post by Polpi)
    hahahahha don't worry i have better things to do in the future than ruin potential careers with meaningless mark schemes :P
    Hahahaha well that's good, best of luck :yy:

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    (Original post by PlayerBB)
    Hahahaha well that's good, best of luck :yy:

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    Btw do you know what they mean by continuous prose ? Like wrote in paragraphs and organise everything step by step ?
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    Hey! Could someone explain to me when to use Systematic sampling and when to use random sampling? And what's the difference between the two?
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    (Original post by Sandy_Vega30)
    Hey! Could someone explain to me when to use Systematic sampling and when to use random sampling? And what's the difference between the two?
    Systematic- to measure distribution /pattern
    Random-to measure abundance
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    What should be limitations for gel electrophoresis and tensile strength?
    Asking u guys particularly!😊😊😊
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    How to keep oxygen concentration constant inside a respirometer?
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    (Original post by Quirky01)
    What should be limitations for gel electrophoresis and tensile strength?
    Asking u guys particularly!😊😊😊
    Gel electrophoresis- gel denatured,pH changes due to contamination
    Temperature fluctuating
    Tensile strength-microbial action this weakening the tensile strength.
    You know when you add use the same fibre when adding the heavier weights this reduces the elasticity of the fibre throughout the experiment. Watch the video on it through the link the guy talks about the limitations.
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    (Original post by mystreet091234)
    How to keep oxygen concentration constant inside a respirometer?
    Oxygen sensing probes ? No that would just be to measure it idk how to control it
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    (Original post by mystreet091234)
    How to keep oxygen concentration constant inside a respirometer?
    Why would u keep oxygen concentration constant? If u look at a spirometer trace u will see that the trace slopes downwards showing volume of oxygen decreases..we do not keep volume of oxygen constant in spirometer..we only absorb any CO2 produced 😊
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    (Original post by Quirky01)
    Why would u keep oxygen concentration constant? If u look at a spirometer trace u will see that the trace slopes downwards showing volume of oxygen decreases..we do not keep volume of oxygen constant in spirometer..we only absorb any CO2 produced 😊
    No he/she is asking about a respirometer not spirometer
 
 
 
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