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

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    (Original post by Emily90)
    Oh and what did people put for working out the beats per minute and the heart calculation one? Basically the maths questions!
    You divide 60 seconds (1 minute) by the total time of the cycle given to you inn the table which was 0.7 and the answer should be 86 because i rounded 85.7 as it is not correct to say 85.7 heart beats per minute
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    (Original post by Limitless)
    Denature.
    Hydrogen bonds break.
    Tertiary structure changes
    Active site changes
    Enzyme substrate cant form.
    So rate of reaction decreases.
    Yet it was a 2 mark question.
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    (Original post by ??????????????????)
    -Sigh- you quoted the troll. He might return to once again feed.
    Sorry! Went offline and just returned. cba to go through the last 10 pages.
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    (Original post by xkate1019x)
    what did everyone write for the question for explaining why the rate of reaction decreased from 30-50 degreees?
    Said the temperature increased caused the ionic and hydrogen bonds to break causing the 3d tertiarry structure to change shape and active site changes shape so is no longer perfectly complimentry to sumbstrate so rate decreases as fewer substrate-enzyme complexes formed.
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    (Original post by Baha)
    You divide 60 seconds (1 minute) by the total time of the cycle given to you inn the table which was 0.7 and the answer should be 86 because i rounded 85.7 as it is not correct to say 85.7 heart beats per minute
    You can also say 85.
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    (Original post by Limitless)
    Denature.
    Hydrogen bonds break.
    Tertiary structure changes
    Active site changes
    Enzyme substrate cant form.
    So rate of reaction decreases.
    Thanks, i really didn't know what to write here, so how many marks do you think i'd for saying the enzymes start to denature, so there is less active sites available for the substrates to bind to, lowering the rate of reaction (it was worth 2/3 marks i think)
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    (Original post by Wick3d)
    Yet it was a 2 mark question.
    ****...
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    (Original post by xkate1019x)
    Thanks, i really didn't know what to write here, so how many marks do you think i'd for saying the enzymes start to denature, so there is less active sites available for the substrates to bind to, lowering the rate of reaction (it was worth 2/3 marks i think)
    Probably full marks I wrote the same as you I think.
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    (Original post by swiftylol)
    The question with the agar plate... what was it asking for again???

    All i remember is chosing the one with the biggest diameter.
    It asked you to determine the optimum PH for the enzyme to work out as well as the temperature from the graph given on the previous page.
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    You are kidding...it was that simple! lol oh dear....but thank you! What was that heart cycle one again?
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    (Original post by Wick3d)
    Yet it was a 2 mark question.
    AQA just being messed up again. Award 6 mark for vague ones. 1 mark for those which require lots of detail. Make one mistake wrong and you lose 1/2 the marks for the question.
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    (Original post by Limitless)
    ****...
    That's what I thought when I checked my answer.

    It was like I answered a 5 mark question!
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    Emohysema question was four marks, so i spoke about less elasticity in lungs, hard to force air out of alveoli, reduced conc gradient for diffusion and i also said about reduced surface area of alveoli meaning that there is a slower rate of diffusion thoughts?

    also what was the exact wording of the last 6 marks quetion?
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    Grade boundaries (for an a) will not be 50! Who ever wrote that is probably the most retarded person ever
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    (Original post by Emily90)
    You are kidding...it was that simple! lol oh dear....but thank you! What was that heart cycle one again?
    Some people thought the time for one heart cycle was 85/86 beats per minute.
    Others (me including) got 100 beats per minute.
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    (Original post by H2IMRAN)
    Grade boundaries (for an a) will not be 50! Who ever wrote that is probably the most retarded person ever
    It will probably be around 40ish.
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    (Original post by sanaindaclub)
    Sorry! Went offline and just returned. cba to go through the last 10 pages.
    Hey, i know you use the NT book, so for the last question did you write all the stuff it said about Villi and Microvilli in the NT book because it has a specific link to glucose there too?! I never wrote about carrier proteins, totally forgot. woops.
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    (Original post by Wick3d)
    That's what I thought when I checked my answer.

    It was like I answered a 5 mark question!
    Oh well it's better to write more than write less.
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    And for the LAST question, it asked for adaption of EPITHELIAL cells not the SMALL INTESTINE itself! So all the points about villi in the Nelson Thorne book are usless! So things like microvilli, and carrier proteins will gain the marks.
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    Argh. I have a problem with understanding the questions. I thouhgt the pH one was asking how you could be sure that the pH hadnt changed - so i wrote re-mesaure at the end of experiment. Turned out they meant maintain pH. FML! Plus, i forgot that emphsema causes thickening of the alveloi walls!
 
 
 
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