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    (Original post by TheMasterofLife)
    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.
    Did it state what the optimum pH was? Or were we supposed to compare it to the optimum pH of the other sugar?

    Really disappointed in myself for making such a stupid mistake
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    (Original post by caitlinford3)
    Did it state what the optimum pH was? Or were we supposed to compare it to the optimum pH of the other sugar?

    Really disappointed in myself for making such a stupid mistake
    I assumed the greatest volume of CO2 produced means higher amount of substrate is being broken down.
    So I just assumed the highest values were for the optimum pH's - But it wasn't that many marks so dont worry too much
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    (Original post by TheMasterofLife)
    I assumed the greatest volume of CO2 produced means higher amount of substrate is being broken down.
    So I just assumed the highest values were for the optimum pH's - But it wasn't that many marks so dont worry too much
    It was only two I think, but I slipped up on the amino acid question and did 630 / 3
    Can't see any other mistakes I've made otherwise so praying I've only lost those 4 marks
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    (Original post by caitlinford3)
    It was only two I think, but I slipped up on the amino acid question and did 630 / 3
    Can't see any other mistakes I've made otherwise so praying I've only lost those 4 marks
    I feel like I could have said some more relevant stuff for the six markers - as I forgot to mention that the problem in the heart was in the left ventricle, so it would be reducing the hearts ability to pump blood with enough force around the body.

    I also didnt use the words suction or low pressure to describe the transpiration stream
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    For the one about bread and sugars, I said carbohydrase instead of writing amylase. Amylase is a a type of carbohydrase, so will I get the marks?

    For the pentadactyl one, I wrote about five digits and the carpal bone.

    For last six marker- i wrote about osmosis through soil into leaf, root hair cells and xylem vesselsz I kind of mentioned active transport as well, was that right? Then I talked about the stomata in the lead and transpiration. Will I get 6 marks?


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    (Original post by TheMasterofLife)
    I feel like I could have said some more relevant stuff for the six markers - as I forgot to mention that the problem in the heart was in the left ventricle, so it would be reducing the hearts ability to pump blood with enough force around the body.

    I also didnt use the words suction or low pressure to describe the transpiration stream
    I completely forgot to mention the word transpiration and focused on osmosis, root hair cells, diffusion in the stomata, and the xylem and phloem
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    (Original post by TheMasterofLife)
    I feel like I could have said some more relevant stuff for the six markers - as I forgot to mention that the problem in the heart was in the left ventricle, so it would be reducing the hearts ability to pump blood with enough force around the body.

    I also didnt use the words suction or low pressure to describe the transpiration stream
    Nor did I with the transpiration stream! I just said stuff about it being a continuous movement etc etc. I'm sure you'll be fine without mentioning them for both 6 markers
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    (Original post by htkta)
    I completely forgot to mention the word transpiration and focused on osmosis, root hair cells, diffusion in the stomata, and the xylem and phloem
    I think you'll have still got most marks
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    (Original post by sapphire79)
    I think you'll have still got most marks
    I hope so..
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    (Original post by htkta)
    I hope so..
    Either way don't worry about it now. It's done and there's honestly nothing you can do. If you feel disappointed in yourself all you can do is learn from your mistakes for the next exam. And I'm sure you've done great anyway
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    (Original post by sapphire79)
    Either way don't worry about it now. It's done and there's honestly nothing you can do. If you feel disappointed in yourself all you can do is learn from your mistakes for the next exam. And I'm sure you've done great anyway

    Thank you for the support I appreciate it.
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    (Original post by htkta)
    Thank you for the support I appreciate it.
    You're welcome. And if it makes you feel any better, I did core science (unit 1s) last year and felt the exact same way after seeing the unofficial markscheme. I ended up getting an A* so don't spend time worrying I'm sure the same thing will happen to you
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    (Original post by sapphire79)
    You're welcome. And if it makes you feel any better, I did core science (unit 1s) last year and felt the exact same way after seeing the unofficial markscheme. I ended up getting an A* so don't spend time worrying I'm sure the same thing will happen to you


    Wow, that's amazing kinda gives me hope! Thanks, means a lot. I hope everything turns out well.
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    yh I'm pretty sure you all did great, I am literally stressing out trying to remember all of my answers and trying to count all of the marks I lost, I screwed up on the amino acids question, the multiple choice question about the stomach to small intestine, and maybe some marks i lost out on which were like 3 marks - got like 2 marks,
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    I also got 42
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    On the bright side, we still have Chemistry and Physics, AND coursework!!
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    How many marks was the about how yeast cells differ from bacterial cells???
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    Any predictions for an A*? I feel like the paper was good however, the way the questions were worded were different from previous years so I think they cancel each other out. Maybe 51 for an A*?


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    (Original post by SOULEAZ)
    How many marks was the about how yeast cells differ from bacterial cells???
    2 marks
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    (Original post by keepyourapology)
    How did that exam go? Will be posting a mark scheme based on answers soon!

    Special thanks to niichola!
    Spoiler:
    Show
    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.
    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):
    ??
    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):
    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)
    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.
    Question 2 Part B = What is the disadvantage of using the model to show the intestines or somat along those lines :
    Answer : in past paper and i wrote No Villi
 
 
 
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