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    (Original post by chelseajabbau)
    ohhhh right thank you!! i didnt put that i didnt know it happened in the nucleus so i said the other one about amino acids cuz i thought it breaks down proteins into amino acids
    Don't worry its only one mark anyway.
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    (Original post by haybe2k)
    Edited mark scheme
    Spoiler:
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    Question 1 (Bacterial/Yeast Cell) :
    Part (a):
    (yeast cell)
    • has a nucleus (1)
    • does not have a flagellum(1)
    • does not have a plasmid(1)
    • has a vacuole(1)
    (bacterial cell)
    • has chromosomal DNA /circular DNA (1)
    • has a capsule (1)
    • has a slime coat (1)
    • does not have mitochondria (1)
    Part(b):
    Mitochondria. (1)
    Part(c):
    Question about how anaerobic respiration breaks down to form alcohol and carbon dioxide. Compare anaerobic and aerobic respiration of a yeast cell.
    Correct formula for aerobic respiration (1)
    Part (?):
    The values for the table go from 300 -> 400 -> 200. This shows that the Enzyme activity is reduced below or above the optimum temperature/pH.
    This applies to all enzymes, hence most of their graphs have an upside down U-shape.
    So the value for the sucrose/lactose (can't remember which) will not increase as the values go from 28 -> 35 ->
    It will rather decrease to around (28 -7) = 21. It could be from around 17-21, hence it is that is the correct answer.
    (thanks to TheMasterofLife!)


    Question 2 (Digestion):
    Part (a):
    Peristalsis
    Part(b):
    Disadvantages of using the tube as a model : No villi
    Part (c):
    The amylase in the saliva will break down the starch present in the bread to form sucrose.

    Fossils Question :
    Part(a) :D
    Part (b):
    Human Intervention
    Loss of habitat
    Climate Change
    Predators (correlate to increase in group B&C)
    Part(c):
    • The mammals have a humerus;
    • an ulna
    • wrist bones
    • and 5 fingers/digits. There is more to write, but that should be enough. The other answers are:
    • a radius
    • The wrist bones are called carpals
    DNA Extraction:
    Part(a):
    Part(b):Break up proteins in cell membrane.
    Part(c): Only statement 1 is true
    Part(d):
    Differences between mitosis & meiosis:
    Haploid cells vs Diploid Cells (1)
    Genetically Varied vs Genetically Identical (1)
    4 Daughter Cells vs 2 Daughter Cells (1)

    Circulatory System:

    Part(a):Pulmonary Vein
    Part(b):De-oxygenated blood moves into the right atrium via the vena cava, moves to the right ventricle through the valves, and goes to the lungs via the pulmonary artery.
    Part(c):
    Part(d):Six marker on how the narrowing of coronary arteries affect the functioning of the heart and surrounding body cells.
    • The narrower artery is on the left ventricle. By it being narrow, the muscles receive less oxygen and glucose, and will be worker weaker.
    • The ventricle will not be able to contract as strongly as before, causing less heart pressure
    • This will cause a weaker heart, and decrease the cardiac output
    • This means that the less blood will be going throughout the body, meaning more anaerobic respiration when exercising
    • There will be more lactic acid left over
    • There will be a longer excess post-exercise oxygen consumption (EPOC) (didn't actually write it, just realized it now)
    • Decrease the cardiac output
    • Less oxygen for respiration
    • The heart may not get enought blood causing a Heart attack
    • The person may feel tired/lethargic
    Leaves:

    Part(a):
    Part(b):
    Part(c):
    Light is no longer the limiting factor, and hence, increasing the amount of light intensity will not affect rate of reaction, as some other factor is in shorter supply and is controlling the rate.
    Part (d):
    Six marker on movement of water in a plant.

    Osmosis (1)
    water passes through a partially permeable membrane(1)
    water goes from an area of high concentration to an area of low concentration/diffusion (1)
    water is transported through the Xylem(1)
    Transpiration (1)
    Edited mark scheme[/QUOTE]

    There's also a question about how Watson and Crick contributed to understanding of the structure of DNA, I believe that was part (c) but can't promise
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    (Original post by keepyourapology)
    MVP. May I use some answers for the mark scheme?
    I absolutely would not mind at all.
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    (Original post by keepyourapology)
    Anyone remember their answer for the one with the Small Intestine & Bile? The Multipe Choice, I mean.
    Ah yes. I remember this question now. The question was on the role of bile in digestion, and the correct answer was to raise pH and neutralise stomach acid. I'm not sure about the neutralising, but I'm sure that it was to raise pH as the pH of stomach acid is 2, and this must be raised to 7 (neutral) before the food is passed through the intestines and more enzymes are added to it.
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    (Original post by ￸￸hi)
    Ah yes. I remember this question now. The question was on the role of bile in digestion, and the correct answer was to raise pH and neutralise stomach acid. I'm not sure about the neutralising, but I'm sure that it was to raise pH as the pH of stomach acid is 2, and this must be raised to 7 (neutral) before the food is passed through the intestines and more enzymes are added to it.
    Yes making conditions alkaline
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    (Original post by bue34 c)
    Really? so does that mean if you write an answer to a question that is right but isn't on the mark scheme you technically get the marks for it? so does that mean that science oriented examiners will mark our exam? anyway thank you for that you have put my mind at ease.
    I don't know if this was a sarcastic response but the post was intended to put those worrying at ease - as you mentioned. However, I understand that the examiners won't be scientists and that you are unlikely to get a mark for a completely incorrect answer but what I meant in my post is that there are OTHER acceptable answers on the mark scheme and examiners credit what is there; they do not deduct marks if it the markscheme answer is not (this is focused particularly on 6-markers).

    The "unofficial markschemes" being produced could only be students themselves claiming that their answers are right - not to say that they are wrong - but unofficial markschemes are not always accurate and unless it is a teacher or Edexcel examiner themselves then you can't take their word for gospel. Only results day will tell you how it really went!


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    (Original post by TheMythicalBeast)
    Edited mark scheme
    There's also a question about how Watson and Crick contributed to understanding of the structure of DNA, I believe that was part (c) but can't promise[/QUOTE]

    The answer to that was that watson and crick created a 3D model of dna using the research of wilkins and franklin, i think you get a mark for also saying x-ray crystalography
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    (Original post by zoeolo)
    I don't know if this was a sarcastic response but the post was intended to put those worrying at ease - as you mentioned. However, I understand that the examiners won't be scientists and that you are unlikely to get a mark for a completely incorrect answer but what I meant in my post is that there are OTHER acceptable answers on the mark scheme and examiners credit what is there; they do not deduct marks if it the markscheme answer is not (this is focused particularly on 6-markers).

    The "unofficial markschemes" being produced could only be students themselves claiming that their answers are right - not to say that they are wrong - but unofficial markschemes are not always accurate and unless it is a teacher or Edexcel examiner themselves then you can't take their word for gospel. Only results day will tell you how it really went!


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    Oh sorry if it came off as a sarcastic response, it really was genuine. What you wrote did take away a bit of my stress.
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    (Original post by haybe2k)
    There's also a question about how Watson and Crick contributed to understanding of the structure of DNA, I believe that was part (c) but can't promise
    The answer to that was that watson and crick created a 3D model of dna using the research of wilkins and franklin, i think you get a mark for also saying x-ray crystalography[/QUOTE]

    I put that they created a model showing the bases, I didn't put about what Franklin did because they didn't ask about her. I did mention her and Wilkins, though, kind of as a starter because it was after their work that Crick and Watson created the model.
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    (Original post by TheMythicalBeast)
    The answer to that was that watson and crick created a 3D model of dna using the research of wilkins and franklin, i think you get a mark for also saying x-ray crystalography
    I put that they created a model showing the bases, I didn't put about what Franklin did because they didn't ask about her. I did mention her and Wilkins, though, kind of as a starter because it was after their work that Crick and Watson created the model.[/QUOTE]

    Yh i wrote something similar, I wrote that Watson and Crick built the first 3d structure model of dna that showed specific base pairing, I didn't include anything about Franklin and Wilkins because the question just asked what did Watson and Crick do, Franklin and Wilkins did contribute by shining x ray on crystallised Dna thus finding its structure is a double hellx but that isn't what Watson and Crick did.
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    (Original post by ARK_REVISES)
    Yh i agree the last question asked you how does water enter into a plant and how does it travel from roots to rest of plant or something like that. I wrote about osmosis via root hair cells then about xylem vessel, not to sure if you had to mention transpiration anyway because its a loss of water it has nothing to do with water entering a plant, albeit it does create a transpiration stream but still i don't think you necessarily needed to include transpiration.
    I was petrified by it saying transpiration but when u think back about the question it juz asked how water entered the plants...[/QUOTE]

    Actually transpiration creates the water stream that pulls the water up the xylem vessel and into the leaves, so you need it for the marks
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    (Original post by Michaelmulheran)
    I was petrified by it saying transpiration but when u think back about the question it juz asked how water entered the plants...
    Actually transpiration creates the water stream that pulls the water up the xylem vessel and into the leaves, so you need it for the marks[/QUOTE]

    That's what I thought as well haha. It asked how water got to the leaves not just how it entered. I remember clearly. Transpiration is actually needed in the answer. Oh well they probs got marks somewhere else in the answer!


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    (Original post by DamnDaniel2)
    Actually transpiration creates the water stream that pulls the water up the xylem vessel and into the leaves, so you need it for the marks
    That's what I thought as well haha. It asked how water got to the leaves not just how it entered. I remember clearly. Transpiration is actually needed in the answer. Oh well they probs got marks somewhere else in the answer!


    Posted from TSR Mobile[/QUOTE]

    I wrote down osmosis, root hair cells and soil, from high water concentation to low water concentration, through partially permeable walls and xylem vessels to rest of the plants. At the end i was going through the answer again so i could pick up more marks, then i thought bout transpiration but i realized transpiration and stuff didn't satisfy the question.

    Even though i didnt mention it, im 100% sure i got full marks on that by saying the followings things mentioned above.

    When i saw the two six markers i was trembling in joy cos those 2 were easy af... I will get full marks on those but the 2-3 marks questions in fossils and crushed peas, might put me into a high A😭😭😭
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    (Original post by ARK_REVISES)
    That's what I thought as well haha. It asked how water got to the leaves not just how it entered. I remember clearly. Transpiration is actually needed in the answer. Oh well they probs got marks somewhere else in the answer!


    Posted from TSR Mobile
    I wrote down osmosis, root hair cells and soil, from high water concentation to low water concentration, through partially permeable walls and xylem vessels to rest of the plants. At the end i was going through the answer again so i could pick up more marks, then i thought bout transpiration but i realized transpiration and stuff didn't satisfy the question.

    Even though i didnt mention it, im 100% sure i got full marks on that by saying the followings things mentioned above.

    When i saw the two six markers i was trembling in joy cos those 2 were easy af... I will get full marks on those but the 2-3 marks questions in fossils and crushed peas, might put me into a high A😭😭😭[/QUOTE]

    Yh you're likely to get all the marks. Don't worry about it. The grade boundaries (IMO) won't be too high due to the fossil questions and the way some of the questions were worded really weirdly hahaha. There's still hope! Just try and get an A* in B3 for an A* overall!


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    Did anyone get 210 for the DNA, Codon question?
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    (Original post by Asfand786)
    I put down 17, but idk if its right, some people put 18 and some put 15 but it was about an estimate so idk
    I got 19 would it count ?


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    (Original post by bue34 c)
    i got that but its wrong because after the exam i realised 3 bases/ codon = 1 amino acid thus 620 * 3 not divide
    Yeah I did 620 times 3 and got 1890 of something


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    (Original post by Rof74)
    I got 19 would it count ?


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    Yes as the question said estimate not calculate. I put down 17 but i think it should 16-19/20 to be accepted as the correct answer
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    (Original post by ARK_REVISES)
    Yes as the question said estimate not calculate. I put down 17 but i think it should 16-19/20 to be accepted as the correct answer
    Hopefully. My only problem is that people found a correlation between lactose and sucrose results and applied it to the ph9 and calculated 17, so the only acceptable answer may be 17.


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    For the DNA section, Does nayone know the answer about the base/codon question. I got 210 but i'm not sure if thats right?
 
 
 
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