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    (Original post by bdoon esm)
    For the daphnia experiment
    when observing the daphnia under the microscope the light can affect the heart rate due to the increase in temperature
    How can we control this?
    Try to count daphnia in as less time as possible hence using light source for minimum time!
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    (Original post by Annaaix_)
    Benedicts, biuret and iodine are in the gcse course, I think I saw it in a markscheme too! Good to know anyway just incase, you won't lose marks for mentioning
    Biuret solution is very similar to iodine in the way it's used for testing! Just used for proteins and turns purple if present

    What are the enzymes that digest what? I'm so bad with enzymes I know protease is for protein but thats it

    Good luck to you too! x
    Yea i saw the markscheme it was in but the examiner report says
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    Anyway thanks for telling about biuret.
    I just wrote it somewhere up
    Lipase- fats and oils (like butter and oil)
    Carbohydrase- starch solution
    Nuclease- DNA or RNA
    and Protease you'd already know~
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    (Original post by Aimen.)
    Yea i saw the markscheme it was in but the examiner report says
    Name:  ,.hgkk.PNG
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    Anyway thanks for telling about biuret.
    I just wrote it somewhere up
    Lipase- fats and oils (like butter and oil)
    Carbohydrase- starch solution
    Nuclease- DNA or RNA
    and Protease you'd already know~
    Which paper was that?
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    (Original post by Adorable98)
    Which paper was that?
    It was Jan 2015
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    (Original post by Aimen.)
    It was Jan 2015
    Thanks
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    (Original post by Aimen.)
    Try to count daphnia in as less time as possible hence using light source for minimum time!
    I thought the time for counting should be one of the variables that should be controlled?
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    Hii! We have a whatsapp group. As it is easier to revise and communicate through. If any of you want to join, pm your numbers to me and I'll add you. You can add other people then if you want to 😊

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    (Original post by notsoclueless)
    I thought the time for counting should be one of the variables that should be controlled?
    Umm you didn't get me. It's supposed to be same for two concentrations.
    I meant that record the heartbeat for 20 s and then multiply by 3 for 1 minute instead of counting for a whole minute!
    Am I wrong??
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    (Original post by Aimen.)
    Umm you didn't get me. It's supposed to be same for two concentrations.
    I meant that record the heartbeat for 20 s and then multiply by 3 for 1 minute instead of counting for a whole minute!
    Am I wrong??
    Ohh ^^ My bad That sounds fine, i guess
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    Guys in the Jan 2015 paper, the first question is about and experiment to determine the effect of temperature on the rate of respiration in germinating seeds.

    How can I control the variable for "Mass of seeds"?
    And what's the effect on the results of the variable is not controlled?
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    (Original post by dinithisara)
    Guys in the Jan 2015 paper, the first question is about and experiment to determine the effect of temperature on the rate of respiration in germinating seeds.

    How can I control the variable for "Mass of seeds"?
    And what's the effect on the results of the variable is not controlled?
    You measure the seeds using a weigh balance and then choose seeds of equal mass, if you don't the larger seeds would respire more and the results would be due the mass and not temperature!
    Makes sense? ^__^
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    (Original post by Aimen.)
    You measure the seeds using a weigh balance and then choose seeds of equal mass, if you don't the larger seeds would respire more and the results would be due the mass and not temperature!
    Makes sense? ^__^
    Yup thanks 😊
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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.
    I just did that, I had kept it for the end
    Now I'm demotivated too :/ all I got was 43/50 :'( Maynn
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    (Original post by Aimen.)
    I just did that, I had kept it for the end
    Now I'm demotivated too :/ all I got was 43/50 :'( Maynn
    According to the grade boundaries, A* was 38/50. So, that means you've gotten an A* :P
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    Hello,

    Any piece of Unit 4 or Unit 5 biology that you recommend i revise for question 1c tomorrow?

    Good luck to everyone
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    For habitutation, what do they mean by Snails already handled before the experiment may not react in the same way ..
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    (Original post by Adorable98)
    For habitutation, what do they mean by Snails already handled before the experiment may not react in the same way ..
    It's because they may be already habituated and the ca2+ ion channel has already become less responsive!

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    (Original post by Chinu_Cheeku97)
    It's because they may be already habituated and the ca2+ ion channel has already become less responsive!

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    I see thank you!!
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    (Original post by Adorable98)
    I see thank you!!
    You're welcome x


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    All the very best for all of you guys for today's exam .
 
 
 
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