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Edexcel A2 Biology SNAB 6BI04 ~ 6BIO5 June 2016 Watch

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    (Original post by GiveShekels)
    Are you sure we were supposed to?
    I dont remember seeing a habituation question
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    (Original post by zaramillie)
    I dont remember seeing a habituation question
    Sea anemone. You don't remember?
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    (Original post by zaramillie)
    I dont remember seeing a habituation question
    there was, it was a 3 marker
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    (Original post by Bella09)
    Ahh thank goodness I hope so. Because I wasn't sure about genes to remove CO2 so I literally just made up the chloroplast stuff haha. But I put all the stuff about reverse transcriptase making cDNA or restriction endonuclease cutting gene, cut plasmid with same restriction enzyme and use DNA ligase. I think that'll get me a couple marks at least
    dude i did exactly that XD i really do doubt the existence of a CO2 removing gene?!?
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    First question asked what would be expected to happen when the anemone is habituated (something like that) the answer being that it will no longer respond/retract its tentacles. The second question asked to how to carry out a study in how long it takes for the anemone to no longer become habituated.

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    (Original post by GrandMasti)
    What did people get for the 3 mark question on how the three genes inhibited each other in sequence, their activity cycling regularly? And what did you understand by 'cycling regularly'?
    im guessing, but i said: if the 1st gene is on, then the 2nd is off, which means the 3rd is on... and because the 3rd gene inhibits the 1st, the 1st would turn off, causing the 2nd one to turn on, and the 3rd one to turn off, and the cycle repeats
    Hopefully it's not wrong :/
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    (Original post by neevtrehan)
    What did people say for the ecg question?

    I said conduct an ecg for 15 seconds and then count the number of qrs complexes in the trace and multiply by 4 to get heart rate.

    Is that wrong?
    no idea if what you wrote was correct as i wasnt sure myself.

    I said that there is a p wave, t wave and qrs complex to represent atrial systole, ventricular systole and diastole. One cardiac cycle was one beat (??) so you use the ECG for a minute and count the cardiac cycles to work out BPM.

    ?
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    (Original post by aegonsconquest)
    there was, it was a 3 marker
    Oh no. I remember one asking about the release of calcium ions when impulse arrives at the synapse. Do you remember what the habituation question asked?
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    (Original post by mliela)
    Sea anemone. You don't remember?
    Remember talking about the calcium when impulse arrives, but not about the anemone being desinsitised. Meh
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    (Original post by zaramillie)
    Oh no. I remember one asking about the release of calcium ions when impulse arrives at the synapse. Do you remember what the habituation question asked?
    outline a study into habituation with the sea anemone
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    (Original post by mercuryman)
    outline a study into habituation with the sea anemone
    Yes q2 thank you
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    (Original post by zaramillie)
    Yes q2 thank you
    So you did do it right?
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    (Original post by Downymouse59)
    dude i did exactly that XD i really do doubt the existence of a CO2 removing gene?!?
    You could have said that they isolated a gene involved with producing enzymes for carbon fixation
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    What did you guys put for the first MCQ? I put number of myosin heads stays the same...?
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    (Original post by mercuryman)
    So you did do it right?

    I think i answered that one okay, its just the ones after. Im sure we had to talk about how neurotransmitters were released on arrival of an impulse. Some posts say it was about why the anemone was habituated (post synapse unable to repolarise etc)
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    (Original post by zaramillie)
    I think i answered that one okay, its just the ones after. Im sure we had to talk about how neurotransmitters were released on arrival of an impulse. Some posts say it was about why the anemone was habituated (post synapse unable to repolarise etc)
    Its easy to get worked up! Waiting for results eek fingers crossed good luck everyone
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    (Original post by zaramillie)
    I think i answered that one okay, its just the ones after. Im sure we had to talk about how neurotransmitters were released on arrival of an impulse. Some posts say it was about why the anemone was habituated (post synapse unable to repolarise etc)
    I thought it asked what the effect of habituation would be on the anemone itself? so they would withdraw their tentacles less, the more they become habituated? It was only 1 mark
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    (Original post by zaramillie)
    Its easy to get worked up! Waiting for results eek fingers crossed good luck everyone
    Yeah i totally feel you. Lets pray results day turns out fine!
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    (Original post by Downymouse59)
    im guessing, but i said: if the 1st gene is on, then the 2nd is off, which means the 3rd is on... and because the 3rd gene inhibits the 1st, the 1st would turn off, causing the 2nd one to turn on, and the 3rd one to turn off, and the cycle repeats
    Hopefully it's not wrong :/
    Yeah I said something similar along the lines of transcription factors are produced from each gene which acts as promoters/ terminators for the next gene Hopefully it's right
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    What did you guys say about the features of a metabolic pathway when nitrogen from the atmosphere is converted into ammonia using bacteria? It was like 4 marks.
 
 
 
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