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Biology B3 Mark Scheme 21/05/12

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    for question 1aii) i put 3.. would i still get the mark??
    and for 3a) i put aerobic fermentation- would i get the mark for aerobic??
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    (Original post by Basit2010)
    You had to say blood was squeezed at high pressure into the bowman capsule, all glucose was squeezed through. As the liquid flowed along the nephron the glucose was reabsorbed back by ACTIVE TRANSPORT this is because there is a low concentration inside the nephrons and high concentration of blood in the capilieries around the nephron.
    I bet the mark scheme looks for
    -glucose passes through filter
    -reabsorbed by both active transport and diffusion
    -useful substances
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    What do people think the grade boundaries will be for this paper? And is it true that they are making them higher this year, because thats what my biology teacher has told everybody in our set?
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    (Original post by frankayak)
    I bet the mark scheme looks for
    -glucose passes through filter
    -reabsorbed by both active transport and diffusion
    -useful substances
    I put about it passing through the filter, the useful substances and diffusion but not the active transport part, how many marks do you think I'll get?
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    Just wondering, did anybody do the B2 exam today too? I actually found that exam harder than the B3 one and its supposed to be the other way round XD, anybody else find this too?
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    1 evidence that he ran 6 times?
    6 peaks in the graph

    2 how long did he rest after last sprint?
    2.5 minutes

    3 during exercise heart rate increases why?
    more oxygen for aerobic respiration for energy for muscles also removes carbon dioxide and lactic acid

    4 why are the jars filled with nitrogen and air tight?
    the lid prevents micro-ogransisms contaminating the culture and the nitrogen ensures the conditions in each jar are the same

    5 main gas in biogas appart from methane?
    Carbon dioxide

    6 percentage of methane for 2.5% fish fat?
    0.62

    7 conclusion?
    adding fish fat increases the proportion of methane

    8 why would the farmer not put fish fat in his biogas generator? (he lives 112 km away from sea)
    he lives far away from the sea (fish)

    9 what is fusarium doing?
    aerobic respiration

    10 why is important to keep mixture moving?
    to mix Fusarium with the oxygen and prevent it from sedimenting

    11 why not use paddles?
    the branches of the fusarium would get damaged by the paddles

    12 why chicken better for body builders?
    chicken has more protein

    13 why mycoprotein better for health?
    less fat and less cholesterol

    14 why not diffusion?
    diffusion can't happen against a concentration gradient so the concentration inside the plant would be the same as outside

    15 what was uaed instead?
    active transport

    16 how do lots of roots help absorb ions?
    larger surface area

    17 why lots of mitachondria?
    to produce energy for active transport

    18 why lots of starch?
    starch is converted to glucose for energy

    19 what is in healthy urine exept water?
    Urea & (exess) mineral ions

    20 what happens to glucose in kidney?
    the glucose is filtered out of the blood then it is reabsorbed by active transport

    21 why glucose in diabetic urine?
    there is too much glucose to be reabsorbed (not enough energy avialable for the active tranpsort required)

    22 conclusion?
    with maltose increasing DAS concentration decreases the percentage sugar used by yeast. glucose and sucrose not affected

    23 why maltose not absorbed by yeast?
    maltose too big to be absorbed by yeast

    24 why maltose absorbed when DAS not added?
    the enzymes digests maltose into two molecules of glucose which can be absorbed and DAS stops production of this enzyme so maltose cannot be broken down

    25 effect of DAS on alcahol production?
    DAS reduces the percentage of alcohol produced

    26 why beer company not use DAS?
    DAS decreases the amount of alcahol produced & the toxins can make consumers ill

    this is what i put i hate boilogy but it's so easy
    i recon 35 = A* but there is no reason why it couldn't be 38/39 i don't trust boilogy people to be consistent with mark schemes or to say that there will be no questions on biogenesis lol
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    (Original post by Zozzy)
    I put about it passing through the filter, the useful substances and diffusion but not the active transport part, how many marks do you think I'll get?
    Probably 2/3, need active transport
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    (Original post by michelfish)
    1 evidence that he ran 6 times?
    6 peaks in the graph

    2 how long did he rest after last sprint?
    2.5 minutes

    3 during exercise heart rate increases why?
    more oxygen for aerobic respiration for energy for muscles also removes carbon dioxide and lactic acid

    4 why are the jars filled with nitrogen and air tight?
    the lid prevents micro-ogransisms contaminating the culture and the nitrogen ensures the conditions in each jar are the same

    5 main gas in biogas appart from methane?
    Carbon dioxide

    6 percentage of methane for 2.5% fish fat?
    0.62

    7 conclusion?
    adding fish fat increases the proportion of methane

    8 why would the farmer not put fish fat in his biogas generator? (he lives 112 km away from sea)
    he lives far away from the sea (fish)

    9 what is fusarium doing?
    aerobic respiration

    10 why is important to keep mixture moving?
    to mix Fusarium with the oxygen and prevent it from sedimenting

    11 why not use paddles?
    the branches of the fusarium would get damaged by the paddles

    12 why chicken better for body builders?
    chicken has more protein

    13 why mycoprotein better for health?
    less fat and less cholesterol

    14 why not diffusion?
    diffusion can't happen against a concentration gradient so the concentration inside the plant would be the same as outside

    15 what was uaed instead?
    active transport

    16 how do lots of roots help absorb ions?
    larger surface area

    17 why lots of mitachondria?
    to produce energy for active transport

    18 why lots of starch?
    starch is converted to glucose for energy

    19 what is in healthy urine exept water?
    Urea & (exess) mineral ions

    20 what happens to glucose in kidney?
    the glucose is filtered out of the blood then it is reabsorbed by active transport

    21 why glucose in diabetic urine?
    there is too much glucose to be reabsorbed (not enough energy avialable for the active tranpsort required)

    22 conclusion?
    with maltose increasing DAS concentration decreases the percentage sugar used by yeast. glucose and sucrose not affected

    23 why maltose not absorbed by yeast?
    maltose too big to be absorbed by yeast

    24 why maltose absorbed when DAS not added?
    the enzymes digests maltose into two molecules of glucose which can be absorbed and DAS stops production of this enzyme so maltose cannot be broken down

    25 effect of DAS on alcahol production?
    DAS reduces the percentage of alcohol produced

    26 why beer company not use DAS?
    DAS decreases the amount of alcahol produced & the toxins can make consumers ill

    this is what i put i hate boilogy but it's so easy
    i recon 35 = A* but there is no reason why it couldn't be 38/39 i don't trust boilogy people to be consistent with mark schemes or to say that there will be no questions on biogenesis lol

    woah! this is creepy I put nearly all the same answers as you XD, and yeah I think it could be more like 38/39 for an A* this year because according to my Biology teacher at school the government have been saying that Biology GCSE is too easy (which it is really) so apparantly they have to make the grade boundaries higher so that fewer people get A*s
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    (Original post by Zozzy)
    woah! this is creepy I put nearly all the same answers as you XD, and yeah I think it could be more like 38/39 for an A* this year because according to my Biology teacher at school the government have been saying that Biology GCSE is too easy (which it is really) so apparantly they have to make the grade boundaries higher so that fewer people get A*s
    i concur.
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    Why is there glucose in diabetic's urine:

    I put because levels in the blood are so high that not all of it can be re-abosrbed via diffusion and active transport and so some is left in the filtrate to pass out of the body as urine.

    What would i get do you think?
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    (Original post by Zozzy)
    woah! this is creepy I put nearly all the same answers as you XD, and yeah I think it could be more like 38/39 for an A* this year because according to my Biology teacher at school the government have been saying that Biology GCSE is too easy (which it is really) so apparantly they have to make the grade boundaries higher so that fewer people get A*s
    My physics teacher said the same (about grade boundaries)
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    (Original post by rugbymad123)
    Why is there glucose in diabetic's urine:

    I put because levels in the blood are so high that not all of it can be re-abosrbed via diffusion and active transport and so some is left in the filtrate to pass out of the body as urine.

    What would i get do you think?
    personally i would award 2 but you may get 3 if the marker is nice (if nice markers exist lol)

    marks are most likley awared for:

    not all reabsorbed (1)

    because lots of energy needed to move the exess via active transport (2)
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    (Original post by michelfish)
    personally i would award 2 but you may get 3 if the marker is nice (if nice markers exist lol)

    marks are most likley awared for:

    not all reabsorbed (1)

    because lots of energy needed to move the exess via active transport (2)
    It was only two marks wasn't it?
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    (Original post by Zozzy)
    What do people think the grade boundaries will be for this paper? And is it true that they are making them higher this year, because thats what my biology teacher has told everybody in our set?
    Oh joy :')
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    Does anyone remember what the question for 2a is?
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    (Original post by usycool1)
    It was only two marks wasn't it?
    yes i was i realise now lol

    almost definatley 2

    no marks for left in filtrate or pass out of body

    but you may loose a mark for referance of diffusion (but i don't think they are that nasty hopefully)
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    Will I still get a mark for writing 'The heart rate peaks and falls 6 times' for 1)a)i) ?

    And 'the fungi would get broken' for 3)b) ?
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    (Original post by michelfish)
    yes i was i realise now lol

    almost definatley 2

    no marks for left in filtrate or pass out of body

    but you may loose a mark for referance of diffusion (but i don't think they are that nasty hopefully)
    I didn't ask the original question but yeah, it wasn't diffusion
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    (Original post by Zozzy)
    Just wondering, did anybody do the B2 exam today too? I actually found that exam harder than the B3 one and its supposed to be the other way round XD, anybody else find this too?
    I did too, the B2 was waaayy harder
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    What would you say the grade boundaries would be for a low B and a high B because I need a 75 UMS for an A overall??

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