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AQA BIOL2 Biology Unit 2 Exam - 26th May 2011 watch

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  • View Poll Results: Are you resitting this unit?
    YES!
    28.62%
    NO!
    71.38%

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    (Original post by maymaymo)
    me too please ! I hate tissue fluid.
    Will do
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    Does anyone know how they got the answer to 3d on the Januray 2010 paper?! Its only one mark but I'm soo confused?!
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    (Original post by Shopaholic94)
    Does anyone know how they got the answer to 3d on the Januray 2010 paper?! Its only one mark but I'm soo confused?!
    Read the codes as triplets, and then see how many times each triplet occurs. The number of times it occurs is what the table means, you should be able to read off which amino acid it is then
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    (Original post by Shopaholic94)
    Does anyone know how they got the answer to 3d on the Januray 2010 paper?! Its only one mark but I'm soo confused?!
    Its the DNA base coding one right? Well basically on figure 2 you should separate the bases into three's as every 3 bases code for 1 amino acid, therefore you should get, GTT, TAC, TAC, TCT, TCT, TCT, TTA. Now it tells you the name of the amino acid and the numbers it is present in. The first one is done for you i.e GTT codes for Gln. now the next 2 are TAC TAC and so they must code for Met as Met is present twice, again this data is in the table, the next three are all the same i.e TCT now in the table it tells you the only amino acid occuring three times is Arg so you put Arg 3 times and you are left with TTA coding for Asn.
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    (Original post by Kandy_Kain_94)
    Will do
    thank you!
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    That makes so much sense!
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    (Original post by Laura-Robbie)
    would people agree with me that transpiration is less likely to come up as there was a big bit in it in january??
    I agree with you with wishful thinking. That was a resit paper though. There was nothing in the June 2010 paper so I reckon they'll stick something in for the 'first-timers'
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    How do fish maintain a flow of water over the gills?

    Can someone please explain that to me
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    By swimming so water flows into their mouth and out through the gills?
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    (Original post by cherri3)
    How do fish maintain a flow of water over the gills?

    Can someone please explain that to me
    It is through inspiration, in brief, the mouth opens, the floor of the pharynx is lowered due to muscle contractions, the volume of the chamber increases, the pressure decreases and so water enters the mouth. The water then passes over the gills and exchange occurs
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    (Original post by cherri3)
    How do fish maintain a flow of water over the gills?

    Can someone please explain that to me
    Fish can move water by ventilation. Is that what you mean?
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    Syllabus Model answers for :

    Insects use of Tracheae to exchange gases?

    Adaptations of Fish for gas exchange?

    Cheers in advance
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    (Original post by ScienceGeek3)
    It is through inspiration, in brief, the mouth opens, the floor of the pharynx is lowered due to muscle contractions, the volume of the chamber increases, the pressure decreases and so water enters the mouth. The water then passes over the gills and exchange occurs
    ... wat. :nothing:

    we don't need to know this do we? :cry:

    Edit: I'm on AQA, gonna guess (Hope) you're on a different exam board. :p:
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    (Original post by ScienceGeek3)
    It is through inspiration, in brief, the mouth opens, the floor of the pharynx is lowered due to muscle contractions, the volume of the chamber increases, the pressure decreases and so water enters the mouth. The water then passes over the gills and exchange occurs
    Thanks! Do you have to include opercular valves because that really confused me as i have never learnt it but it was in the mark scheme..
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    (Original post by Unbiased Opinion)
    Fish can move water by ventilation. Is that what you mean?
    I thought i would've been that but its something about pressure and valves which i haven't learnt
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    Don't you agree a paper only takes like 1 hour 15 for a proper run through?

    You literally got 30mins to check/maybe do the question you skipped
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    (Original post by cherri3)
    Thanks! Do you have to include opercular valves because that really confused me as i have never learnt it but it was in the mark scheme..
    You could do if you wanted to, however even in the NT books it just states that water after being taken in through the mouth is forced over the gills and out through an opening on each side of the body, so I wouldn't worry too much about them
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    (Original post by cherri3)
    I thought i would've been that but its something about pressure and valves which i haven't learnt
    I don't know that stuff either. :afraid: This is why I avoid TSR around exam time.

    Good luck tomorrow btw!
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    im hoping heamoglobin does not come up much!!!
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    (Original post by Unbiased Opinion)
    ... wat. :nothing:

    we don't need to know this do we? :cry:

    Edit: I'm on AQA, gonna guess (Hope) you're on a different exam board. :p:
    I am on AQA too unfortunately I thought this was covered by ventilation in fish? Have you not covered this or maybe you have learnt something differently? I would check on the syllabus to make sure though!
 
 
 
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