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AQA BIOL1 Biology Unit 1 Exam - 16th May 2011 watch

  • View Poll Results: Are you resitting this unit?
    YES!
    54.92%
    NO!
    45.08%

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    (Original post by EffKayy)
    I really do hope so - i talked about volume \:
    same so did I , i feel now looking back on it that i rushed the paper and have made mistakes which are careless and could cost me a lot of UMS ****
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    (Original post by EffKayy)
    Thankyou.. i'm really paranoid. sorry.
    in total around 46-48, an A? |:
    Yes, most likley.

    I felt like you feel now in January, just relax. By the looks of it you have the A you deserve, maybe even up to 100ums if the boundaries are low.
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    (Original post by EffKayy)
    I really do hope so - i talked about volume \:
    You need to relax I suggest turning the computer off and going to bed. I mean finding out what you have got wrong is not going to help you right now is it, it's just going to make you more worried and nervous about the next unit? There is nothing you can do, but revise for the next unit.
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    (Original post by EffKayy)
    what was the answer to the person breathing out, what showed it?
    I just wrote that the volume if air decreased. Knew which one was the one with lung disease because he was expelling much less air than the other persoan.
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    (Original post by sanaindaclub)
    I just wrote that the volume if air decreased. Knew which one was the one with lung disease because he was expelling much less air than the other persoan.
    sameeeeeee

    thanks guys, atleast i've got some moral support, going to focus on unit 2 now! (shock ;O :L )
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    (Original post by swiftylol)
    Yes, most likley.

    I felt like you feel now in January, just relax. By the looks of it you have the A you deserve, maybe even up to 100ums if the boundaries are low.
    thanks! I'm kinda ishh... calm now

    Thanks for the support anyways (:
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    It was definitely volume don't worry people, I remember the question on emphysema on why B is the diseased bloke because his volume does not decrease as substantially during exhalation compared to A.
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    Lets clarify this!

    Lumen of Intestine (Ileum in the case of the question due to the epithelial cells) contains Villi.

    On those villi are lots of Epithelial Cells.

    Each Epithelial cell has lots of foldings called microvilli. This increases the surface area of the epithelial cells which allows for faster rate of diffussion to occur. (For this question I tried to use what I learnt from the other exam papers I done and wrote "So increases rate of diffussion after each explanation" hopefully those will earn me marks :P)

    For the question it was the microvilli that was required to be explained as an adaptation. This is because microvilli are on the epithelial cells and Not villi on epithelial cells.

    Anyway moving onto other questions, what did people get on the heart pressure questions? I got a 0.5 different (larger value (time) minus smaller value (time)). I got this as these were the times where the ventricle pressure was higher than the atria pressure. This causes the atrioventricular valves to be forced shut due to the pressure.

    Also how many marks would this be for the phagocyte question? - Phagocytes surround (forgot to use engulf) the pathogen and wrap around it. This forms a vesicle inside the phagocyte (forgot to say phagosome), this then joins with another vesicle containing digestive enzymes which break down the pathogen and display the antigen on their surface to initiate T-cells and hence B-cells (immune response).


    I hope I get good grades for this, I found the test alright but its just I ran out of time to get the last sentence in the very last question. I think I probs lost about 4-5marks at most, fingers crossed (I said the same thing las time I did it and lost lots of marks )
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    (Original post by EffKayy)
    sameeeeeee

    thanks guys, atleast i've got some moral support, going to focus on unit 2 now! (shock ;O :L )
    Lol, good luck! I really am failing unit 2
    I know nothing about Chap 14/10/8/11/15/16/17. Fun times!
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    (Original post by behnam1991)
    Lets clarify this!

    Lumen of Intestine (Ileum in the case of the question due to the epithelial cells) contains Villi.

    On those villi are lots of Epithelial Cells.

    Each Epithelial cell has lots of foldings called microvilli. This increases the surface area of the epithelial cells which allows for faster rate of diffussion to occur. (For this question I tried to use what I learnt from the other exam papers I done and wrote "So increases rate of diffussion after each explanation" hopefully those will earn me marks :P)

    For the question it was the microvilli that was required to be explained as an adaptation. This is because microvilli are on the epithelial cells and Not villi on epithelial cells.

    Anyway moving onto other questions, what did people get on the heart pressure questions? I got a 0.5 different (larger value (time) minus smaller value (time)). I got this as these were the times where the ventricle pressure was higher than the atria pressure. This causes the atrioventricular valves to be forced shut due to the pressure.

    Also how many marks would this be for the phagocyte question? - Phagocytes surround (forgot to use engulf) the pathogen and wrap around it. This forms a vesicle inside the phagocyte (forgot to say phagosome), this then joins with another vesicle containing digestive enzymes which break down the pathogen and display the antigen on their surface to initiate T-cells and hence B-cells (immune response).


    I hope I get good grades for this, I found the test alright but its just I ran out of time to get the last sentence in the very last question. I think I probs lost about 4-5marks at most, fingers crossed (I said the same thing las time I did it and lost lots of marks )
    I didnt meantion immure response for the 4 marks on phagocytes, i jsut talked about phagocytosis and lysosmes and all that.
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    (Original post by Emily90)
    What is a definite C for Unit 1 btw?
    C's 60% i assume. so thats 36
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    (Original post by behnam1991)
    Lets clarify this!

    Lumen of Intestine (Ileum in the case of the question due to the epithelial cells) contains Villi.

    On those villi are lots of Epithelial Cells.

    Each Epithelial cell has lots of foldings called microvilli. This increases the surface area of the epithelial cells which allows for faster rate of diffussion to occur. (For this question I tried to use what I learnt from the other exam papers I done and wrote "So increases rate of diffussion after each explanation" hopefully those will earn me marks :P)

    For the question it was the microvilli that was required to be explained as an adaptation. This is because microvilli are on the epithelial cells and Not villi on epithelial cells.

    Anyway moving onto other questions, what did people get on the heart pressure questions? I got a 0.5 different (larger value (time) minus smaller value (time)). I got this as these were the times where the ventricle pressure was higher than the atria pressure. This causes the atrioventricular valves to be forced shut due to the pressure.

    Also how many marks would this be for the phagocyte question? - Phagocytes surround (forgot to use engulf) the pathogen and wrap around it. This forms a vesicle inside the phagocyte (forgot to say phagosome), this then joins with another vesicle containing digestive enzymes which break down the pathogen and display the antigen on their surface to initiate T-cells and hence B-cells (immune response).


    I hope I get good grades for this, I found the test alright but its just I ran out of time to get the last sentence in the very last question. I think I probs lost about 4-5marks at most, fingers crossed (I said the same thing las time I did it and lost lots of marks )
    what else did you write for the 'microvilli' then? ..
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    I didn't explain much more on the microvilli. I said about lots of mitochondria for aerobic respiration to form energy in the form of ATP for active transport to allow transfer of molecules to occur against concentration gradient. Also I said about the co-transport proteins for diffussion of molecules such as glucose/sodium which help diffussion to occur down conc. grad of sodium and against conc grad of glucose. Also I said about the close blood supply which reduces the diffussion distance and maintains conc. grad as glucose rich blood constantly moves away and low conc. glucose blood comes in. Also after each one I said it helps increase the rate of diffusion.

    Something I forgot is enzymes on the surface of epithelial cells (e.g. Maltase) which help break down molecules into absorbable sizes.


    Another thing, about the lactose question about diarrhoea (almost wrote about flatulence but read it again and realised). I said it moves in ileum and is not broken down and cannot be absorbed as it is too large. This lowers the water potential of lumen to lower than epithelial cells and this causes water to be diffused by osmosis down a conc. grad (from negative water potential to more negative water potential) causing water to be removed and diarrhoea to occur.
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    (Original post by behnam1991)
    I didn't explain much more on the microvilli. I said about lots of mitochondria for aerobic respiration to form energy in the form of ATP for active transport to allow transfer of molecules to occur against concentration gradient. Also I said about the co-transport proteins for diffussion of molecules such as glucose/sodium which help diffussion to occur down conc. grad of sodium and against conc grad of glucose. Also I said about the close blood supply which reduces the diffussion distance and maintains conc. grad as glucose rich blood constantly moves away and low conc. glucose blood comes in. Also after each one I said it helps increase the rate of diffusion.

    Something I forgot is enzymes on the surface of epithelial cells (e.g. Maltase) which help break down molecules into absorbable sizes.


    Another thing, about the lactose question about diarrhoea (almost wrote about flatulence but read it again and realised). I said it moves in ileum and is not broken down and cannot be absorbed as it is too large. This lowers the water potential of lumen to lower than epithelial cells and this causes water to be diffused by osmosis down a conc. grad (from negative water potential to more negative water potential) causing water to be removed and diarrhoea to occur.
    I forgot to write about mitochondria and all the stuff about sodium transport shizz :'(. i wrote about blood supply and maintains gradient. urghh i've effed it up.
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    (Original post by EffKayy)
    I forgot to write about mitochondria and all the stuff about sodium transport shizz :'(. i wrote about blood supply and maintains gradient. urghh i've effed it up.
    Trust me you haven't. The last questions on the Unit 1 are generally 4-6 marks each and the mark scheme gives 7+ possible answers. This was a 6marker so I expect about 10 marking points. only like 3-4 points are really needed to be expalined and added with a "so rate of diffussion is increased".
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    (Original post by behnam1991)
    Trust me you haven't. The last questions on the Unit 1 are generally 4-6 marks each and the mark scheme gives 7+ possible answers. This was a 6marker so I expect about 10 marking points. only like 3-4 points are really needed to be expalined and added with a "so rate of diffussion is increased".
    I wrote soo much about villi etc :| this was VERY vague and nothing like specific 5markers in the past! \: I've lost an A.
    grade boundaries for an A estimate?
    I also got the calculations wrong.
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    what do you think the grade boundaries were? this exam annoyed me it was so vague
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    (Original post by Limitless)
    Epithelial cell have villi on them the villi have a substructure called microvilli on them to further increase S.A. Sodium potassium pump and carrier protein help with changing the concentration so that glucose can be absorbed.

    Did you put short diffusion pathway as the epithelial cell is one cell thick?
    I dont understand. If the epithelial cell is a cell, how can it be one cell thick? surely u mean that the lining is one cell thick?
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    (Original post by marijuana)
    I dont understand. If the epithelial cell is a cell, how can it be one cell thick? surely u mean that the lining is one cell thick?
    The distance from one side of the epithelial to the other is one cell hence it is one cell thick.
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    guys for the lactose i put it moves in intestine and lowers water poten so water flows from cells to intestine lol
 
 
 
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