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    I barely revised and feel like I managed to answer every question pretty well which is pretty strange. Found it a really easy paper :s Probably completely wrong though!


    edit: I put theory... because she had a theory about the woodlice and then proved it.
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    (Original post by Swaying Eel)
    edit: I put theory... because she had a theory about the woodlice and then proved it.
    That what I thought...
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    (Original post by pingu09)
    I found the exam hardd :-( Jan 2010 was alot easier... so much ecology/abiotic factor crap in this!
    and this is the crraaapest section in the bookkkkkkkkkkkkkkk
    :eek3:
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    (Original post by peterejhamilton)
    That what I thought...
    Well you got a U in january Pete so I won't believe you...... :p:
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    (Original post by Swaying Eel)
    Well you got a U in january Pete so I won't believe you...... :p:
    I didn't exactly see that coming and you can hardly say im bad at biology.

    That said, yes, I did get a U. :'(
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    They asked about what type of data this is. And the only 'data' given was the girl's observations O_O
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    (Original post by Doughboy)
    Question 1: death and cooling
    Question 2: light, GPP, chloroplasts
    Question 3?: Species
    Question 4?: Immunity
    Question 5?: Growth rate and temperature
    Question 6?: Protein synthesis
    Question 7: Woodlice and girl
    Question 8: Antibiotics

    All ?s mean I can't remember the number! But those are the topics.
    ==============

    Question 1: >>two things you can use: rigor mortis and decomp
    >>reliability: at first it's reliable when Time After Death [TAD] is small. That's because we have a small standard deviation [SD] so core temperatures don't vary much. As T.A.D increases, S.D. increases which means the data has more variability and so less reliable. I kinda messed this up, so don't quote me on this!
    >>three factors: clothing, weight/mass/size of body, where body died, mode of death [needed to be specific]

    Nine marks! Two for MCQs, Four for reliability, Three for factors&cooling.
    ================
    Question 2:
    >>why all light not used or something? some not right wavelength, some reflected back, some passes right through
    >>84.8% of GPP
    >>Respiration [MCQ]
    >>Chloroplasts and ATP! Mention: photosystems, thylakoid, chlorophyll, light harvested, photoexcitation, electrons down transport chain, loss of energy from redox reactions, coupled to H+ pumping in, H+ diffuse out, this movement provides energy for ATP Synthase to drive phosphorlyation of ADP to make ATP. I guess you can mention photophosphorylation. Again, this isn't an expert answer... just a guide! I dunno if we needed the proton gradient points.

    11 Marks! 2 for light, 1 for respiration, 2 for %, 6 for chloroplast
    Edit/Delete Message
    ======================
    Question 3?: Species

    >>why scientists class them as varieties and not species? for three marks? I just put:
    similar characteristics/features, genes can flow between them, can reproduce to produce viable offspring, similar mating/flowering periods
    >>genetic diversity: variety of different alleles/genes within a population/gene pool.
    >>why hybrid more genetically diverse? cause it receives alleles from TWO varieties so it receives a greater variety of genes [im not sure about this!
    >>6 MARKER ON SPECIATION AND REPRODUCTIVE ISOLATION. Answer from sample:
    1. different (environmental) conditions in the different
    areas;
    2. different selective pressures;
    3. some fish better adapted than others (in each
    population);
    4. use of example of an adaptation from information;
    5. these more likely to survive to breed;
    6. and pass on their {alleles / genes} (to next generation);
    7. process of selection continues {in each generation / over
    many generations};
    8. allele frequencies of {favourable/eq} increases;
    9. correct use of term natural selection;

    13 marks! 3 for reasons why, 2 for genetic div. definitions, 2 for hybrid, 6 for speciation.
    ============================
    Question 4?: Immunity

    MCQ: histamine for inflammation, lysozyme for secretions

    Flow chart: antigen, plasma cell, antibodies, phagocytes, hydrolytic or digestive enzymes from lysozomes. [5 marks]

    Why the above processes may only be used on SOME bacteria? 3 marks. It's cause it was a secondary response! The body may have been infected by some bacteria before and become iummune against it. Maybe mention B memory cells. I hated this question so I dunno what to say?

    I think the total for this question is 10. Maybe 11 if there was an MCQ I missed out.
    =============================
    Question 5?: Growth rate and temperature

    We were told alga were eukaryotic:

    MCQs: mitosis for growth, plasmids for not present
    Independent variable? Temperature
    Describe graph? Growth rate increase up to 22 degrees. Decreases after. Refer to enzymes and metabolism and rate of reaction. Optimum at 22 degree. Denaturation beyond 22 degrees. 4 marks.

    Why high light intensity? 3 marks! I only got like a point, to ensure temperature was limiting factor. Under high light intensity you get maximum photosynthesis and food production so only factor affecting growth is temperature. I prolly got this wrong lol. Dumb question.

    Two abiotic factors to control: solution PH, salinity, O2 concentration?

    12 marks. two for mcq, one for variable, four for graph, 3 for explaining light and two abiotic.
    ==============================
    Question 6?: Protein synthesis

    I think we had to compare DNA and RNA for four marks in the table:
    1. str8 chain: RNA only
    2. pentose: both
    3. CGAT: DNA
    4. phosphodiester bonds: both

    Then this vague and retard six marker (in two parts, 3 each) on referring to their data for transcription and translation. I just simply described transcription and translation without referring to data. [6 marks]

    Why final codon didn't have corresponding tRNA? Stop codon maybe? Doesn't code for amino acid so not tRNA needed. Intron? 2 marks.

    12 marks! four for DNA/RNA, 6 for tras[scription/lation], 2 for codons at end
    ================================ =
    Question 7: Woodlice and girl

    MOST RETARDED QUESTION EVER.

    Woodlice and carbon cycle? 3 points. decompose, release enzymes, break down dead matter into organic molecules, they respire these molecules aerobically to release c02. [3]

    One mark for finding means. [1]

    What the girl's data was? I was tempted to put theory or hypothesis, but they asked for DATA... so i put OBSERVATIONS. Not sure! [1 mark]

    Why it's hard to find some abiotic something? Wtf?! Seriously what the hell were they asking us? 3 marks.

    Two abiotic factors on woodlice: light intensity, 02 conc., humidity [ two marks.]

    Total: 10
    =============================
    Question 8: Antibiotics

    bactericidal

    How vanco works? weakens cell walls [prevents bonds forming/crosslinking], places osmotic pressure on cells, cell lysis] 2 marks.

    2 marks on why docs should limit prescriptions. To prevent antibiotic resistance developing and something else? reducing selective pressures maybe..

    4 marker on everyone favourite core practical! Antibiotics and agar plate!
    1. Ref. to a specific aseptic technique
    2. Bacterial lawn/pour plate
    3. Use of antibiotic discs / antibiotics incorporated into agar
    /eq
    4. Incubate for 24-36 hours
    5. At 25-30 °C
    6. Record bacterial growth/eq

    9 marks.
    ================================ =
    The above 'mark scheme' is missing like 4 marks. Most of the paper is posted above anyway. Lemme hear your thoughts and if harder than January 2010 or not? Boundary predictions?



    not in that order rite swear down it was bcells-antibodies....cnt remember the others
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    (Original post by peterejhamilton)
    I didn't exactly see that coming and you can hardly say im bad at biology.

    That said, yes, I did get a U. :'(
    Haha, no, you're better than me anyway. Do you have any idea who this is?


    (Original post by Doughboy)
    They asked about what type of data this is. And the only 'data' given was the girl's observations O_O
    Really? I don't remember the question but if that's what it was, concerning "data", then you're probably right... :dontknow:
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    (Original post by Swaying Eel)
    Haha, no, you're better than me anyway. Do you have any idea who this is?
    No.

    Coggins...?
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    (Original post by peterejhamilton)
    No.

    Coggins...?
    Yes! Well done sir. Did you find that exam a piece of piss perchance?
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    Looks about the same difficultly as Jan 2010 by looking at the markscheme. It appears strange that TB/HIV didn't come up.
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    the order was i belive now...(for the flow chart)b cells,

    b cells,antibodies,antigens,comple metary receptor.then phagosome/or phagocte or macrophage... i think
    also for the question on the next page i was slightly confused as it was a non-specific response in which no specific antigens are 'looked for' so to speak...
    and the macrophages just engulf anthin' foreign...
    any thoughts.......
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    WFT DID T.B H.I.V not *** up:eek3:

    i hate it when this happens missing large chunks:mad:
    in favor of blaaadyyy ecology woodlice ****

    :cool:
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    How can the B Cell release antibodies without coming into contact with the antigens?
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    (Original post by Doughboy)
    How can the B Cell release antibodies without coming into contact with the antigens?
    the question was sort of going in the direction... of the process i said
    but i get your point... i cnt remember now .
    the b cells produce antibodies they then bind to the complementay antigen etc... (i put it in this order,as did many other people i know coz the parts of the question already filled in lead me to belive this was the order)
    i dunno??????????????????????????? ??????????
    WHAT DOES ANYONE ELSE THINK:eek3:
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    ANd also on the flow diagram question it was talkin bout receptors and the lysosome... Therefore indicating tht the antibodies were already produced, I dnt think the question was heard towards the birth of the antibodies in which plasma cells, cytokines ect ... Would have been evident it was after therc creation and how the antigen presentin cell is engulfed and destroyed by our trusty phagocytes... I dunno tht was the aura I got frm the question. I may be wrong. I THINK I may be slighlty obsessed with this one question and have just realised tht. Lol :yep:
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    for the 6 mark question about the 2 types of plants and how they developed from a common ancestor i wrote about habitual isolation and temporal isolation as i think thats what they wanted when they gave us the graph not sure though anyone got the same answer
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    (Original post by Swaying Eel)
    Yes! Well done sir. Did you find that exam a piece of piss perchance?
    Indeed I did. I know i f***** up a few questions and dropped a few marks but compared to jan. No question it was a better and easier paper.

    Now lets just hope they mark the paper properly this time!
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    (Original post by kiss_my_asthma_99)
    for the 6 mark question about the 2 types of plants and how they developed from a common ancestor i wrote about habitual isolation and temporal isolation as i think thats what they wanted when they gave us the graph not sure though anyone got the same answer
    i also talked bout those types of isolation along with geograpical,and temproral, but coz i failed to read the question properly i started gibbering on about speciation and geograpical issolation....changes in allele frequency... ect.... i cn't remember if i did mention antin to do with animals(fail)lol... but i was totally oblivios to the fact it was bout plants...

    i belive i only clawed in 3 marks from this question if this is the case:yep:
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    I mentioned geographical isolation [highland, lowland]. Different conditions etc.
 
 
 
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