Turn on thread page Beta
    Offline

    1
    ReputationRep:
    (Original post by amchambers)
    there was one about which 1 is not present in that wierd plant one and it was cross the box one out of lysosmes, mitochondrion, ribohsomes and plasmid i think.
    Then there was another which had the function of each thing and you had to say if it was in eukaryotic or prokaryotic cells or both. do u remember what you put?
    yeh - mitochondria - eukaryote
    - flagellum - prokaryote
    - plasmid - prokaryote
    Offline

    1
    ReputationRep:
    I found the exam hardd :-( Jan 2010 was alot easier... so much ecology/abiotic factor crap in this!
    Offline

    9
    ReputationRep:
    No.

    Mitochondia - E
    Flagellum - Both
    Plasmid - P

    Easy freaking paper.

    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.
    Offline

    1
    ReputationRep:
    All that HIV/TB stressing for nothing... would have been 10 easy marks in the bag :-s
    Offline

    9
    ReputationRep:
    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.
    Offline

    9
    ReputationRep:
    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
    Offline

    1
    ReputationRep:
    (Original post by Doughboy)
    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.
    Yep got all the bits, except the reliability... I didnt understand what standard deviation is :-s or the purpose of it!
    Offline

    9
    ReputationRep:
    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.
    Offline

    9
    ReputationRep:
    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.
    Offline

    9
    ReputationRep:
    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.
    Offline

    9
    ReputationRep:
    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
    Offline

    9
    ReputationRep:
    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
    Offline

    9
    ReputationRep:
    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.
    Offline

    9
    ReputationRep:
    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?
    Offline

    1
    ReputationRep:
    Hmmm... upon reflection, if you had revised more thouroughly this would have been an okk paper.

    Still think Jan was more straight forward, except the stupid cowpat crap :-s
    Offline

    9
    ReputationRep:
    I think this paper was quite knowledge-based.
    Offline

    0
    ReputationRep:
    (Original post by pingu09)
    Hmmm... upon reflection, if you had revised more thouroughly this would have been an okk paper.

    Still think Jan was more straight forward, except the stupid cowpat crap :-s
    what no, this was the BEST paper we could have ever gotten,
    Are you kidding ? NO HIV, NO TB.:woo:
    Offline

    9
    ReputationRep:
    I was really glad global warming, succession, DNA PROFILING, electrophoresis didn't come.

    Basically global warming and HIV/TB took up almost a quarter to half of unit 4 and they didn't come. Lol, nice going Edexcel.
    Offline

    9
    ReputationRep:
    (Original post by samydude)
    what no, this was the BEST paper we could have ever gotten,
    Are you kidding ? NO HIV, NO TB.:woo:
    Yea, I know. Come on MSN now please.
    Offline

    1
    ReputationRep:
    lol I LOVED HIV n TB lol
 
 
 
The home of Results and Clearing

3,209

people online now

1,567,000

students helped last year

University open days

  1. London Metropolitan University
    Undergraduate Open Day Undergraduate
    Sat, 18 Aug '18
  2. Edge Hill University
    All Faculties Undergraduate
    Sat, 18 Aug '18
  3. Bournemouth University
    Clearing Open Day Undergraduate
    Sat, 18 Aug '18
Poll
A-level students - how do you feel about your results?

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.