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

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    (Original post by etherealinsanity)
    I was doing a past paper (June 2014) and did question 4(a) and the answer referred to a phagosome and phagocytic vesicle. In previous papers, it said to only accept phagocytic vacuole.

    Does anyone know if there's a difference between a phagosome, phagocytic vesicle and phagocytic vacuole?

    The markscheme for 2014 is here:
    http://qualifications.pearson.com/co...-June-2014.pdf

    and the answer is on page 26.
    Maybe it's a mistake, but I'd stick to phagocytic vacuole just to be on the safe side
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    (Original post by Romanoff)
    Maybe it's a mistake, but I'd stick to phagocytic vacuole just to be on the safe side
    Okay, I'll do that. Thank you.
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    (Original post by Oshoko)
    Is it ATPase or ATPsynthase in thylakoid membrane, I've seen mark schemes interchange with this one and I don't which one I should use.
    They're the same enzyme; they're interchangeable.
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    (Original post by PhysicsIP2016)
    Yes but only macrophages. The original posters were asking about B cells
    so b cells also form apc?
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    Someone please explain difference between GPP and NPP? And the definitions if its like a 3 marker for each definition?
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    (Original post by ABeingOnEarth)
    Someone please explain difference between GPP and NPP? And the definitions if its like a 3 marker for each definition?
    GPP/NPP – 3.3.7  NPP =GPP – plant respiration  Net primary productivity = potential energy plant has stored  Gross primary productivity = amount of energy produced by a plant  energy lost as heat / eq ;  provide energy for {active transport / any other named energy-requiring process} ;  NPP is {(stored) energy / energy available for next trophic level / eq} ;
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    (Original post by ABeingOnEarth)
    Someone please explain difference between GPP and NPP? And the definitions if its like a 3 marker for each definition?
    Always include the word equation in GPP/NPP definition
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    (Original post by ABeingOnEarth)
    Someone please explain difference between GPP and NPP? And the definitions if its like a 3 marker for each definition?
    GPP is the rate at which energy is incorporated into organic molecules in producers whereas NPP is the energy transferred to new biomass by producers which is available to the next trophic level.
    These are both measures in KJ per metre squared per year

    Equation: GPP= NPP + R

    hope that helps!
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    In chemiosmosis in the light dependent reaction of photosynthesis, when hydrogen ions from photolysis are pumped across the election carrier molecules are they pumped from the thylakoids membrane into the intermembrane space?


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    (Original post by geor_thor)
    In chemiosmosis in the light dependent reaction of photosynthesis, when hydrogen ions from photolysis are pumped across the election carrier molecules are they pumped from the thylakoids membrane into the intermembrane space?


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    i think youre confusing this with respiration..
    H+ are pumpe from the stroma into the tylakoid.


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    (Original post by ranz)
    i think youre confusing this with respiration..
    H+ are pumpe from the stroma into the tylakoid.



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    Oh ok. Thank you!
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    (Original post by geor_thor)
    Oh ok. Thank you!
    no no its the other way round! H+ ions build up in the thylakoid and move down their conc gadient into the stroma via ATP synthase.
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    Overall... Bit of a harder paper, the graoh questions (( also had to rush a few because of timing
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    What did you put for structure Q ? I put golgi....
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    so much AS came up lol good for anyone who resat AS (i didnt )
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    (Original post by drjay24)
    What did you put for structure Q ? I put golgi....
    I put Golgi too lol

    That paper was dodgy as hell. It was filled with graph readings, random pathology questions that have an unclear answer, and bloody Biology 2 questions.

    I mean really the structure of Cellulose, preparing a slide and Male nuclei in plants. Edexcel are dicks.

    The last question was impossible for me
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    I put golgi too but i think it was rER idk if i done well or not, some q's like the male nuclei pollen one i completely did not revise idkkkkkkkkkkkkkk
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    (Original post by drjay24)
    What did you put for structure Q ? I put golgi....
    I put cytoplasm and argued that it would contain ribosomes, due to the next question. However, I think the right answer was ReR.... Because the next question you would have to argue about it being to do with protein synthesis.
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    did you guys think it was harder than the past papers?? like a lot harder?
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    (Original post by Indigo.Brownhall)
    I put cytoplasm and argued that it would contain ribosomes, due to the next question. However, I think the right answer was ReR.... Because the next question you would have to argue about it being to do with protein synthesis.
    Yeh I put cytoplasm too but the cytoplasm is related to protein synthesis as it contains ribosomes floating about.

    Overall I thought it was a pretty nice paper, especially since I did the unit 2 resit.
 
 
 
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