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    which statements were true? or was is it neither?
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    Guys for the question with the cross section of the leaf to do with the chloroplasts did you guys talk about carbon dioxide or light intensity? I spoke about carbon dioxide because i thought it said diffusion in the question but now i think im wrong
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    (Original post by SOULEAZ)
    which statements were true? or was is it neither?
    I put neither, but someone said it's only statement 1 (small intestine receives food from stomach) so idk.
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    was one of the answers peristalisis? or osephagus? because it said physical
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    (Original post by OKPeaceHD)
    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
    FOR the dna extraction, that wasnt even an option, but it is true. I swear it was said in a different format wasnt it?
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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 vessels 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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    What did you guys answer about the sugar... Something like how is the sugar made in the small intestine?
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    (Original post by vik_k1)
    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 vessels 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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    Yeah, definitely, I don't think they expected amylase anyway.

    That's fine, I did too, so I think we should be okay.

    Well, if you mentioned active transport in relation to mineral ions, then yeah. I'm not so sure about water. But I think you'd get 4-6 marks, definitely!
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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
    Man In first try i got the answer 1890 but then I thought you should times by two again cos it was asking for bases but I didn't read q properly which made me get 3000 as it was about base pairs
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    (Original post by keepyourapology)
    Yeah, definitely, I don't think they expected amylase anyway.

    That's fine, I did too, so I think we should be okay.

    Well, if you mentioned active transport in relation to mineral ions, then yeah. I'm not so sure about water. But I think you'd get 4-6 marks, definitely!
    Thanks, makes me feel a bit more relieved.


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    For the mitosis vs meiosis question I just wrote the differences meiosis cells had I didn't actually discuss the cells produced in mitosis because of how mark schemes are written in past papers. I'm really worried, have I missed out on the marks?
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    I did that too but my cousin just said she divided aghhh
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    Six marker on how the narrowing of coronary arteries affect the functioning of the heart and surrounding body cells.

    i wrote that less blood will be pumped to the body cells due to narrowing of the coronary arteries. The body cells will therefore receive less oxygen and glucose which is carried in blood and these substances are need for respiration. Due to this the rate of respiration for the body cells will be slower. The heart will also have to work harder. It would have to beat harder and more often to get enough glucose and oxygen to the body cells and so increasing number of beats per minute. With the heart having to work hrder and beat more in one minute this may cause heart attacks and stroke.
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    (Original post by westboy 2016)
    Six marker on how the narrowing of coronary arteries affect the functioning of the heart and surrounding body cells.

    i wrote that less blood will be pumped to the body cells due to narrowing of the coronary arteries. The body cells will therefore receive less oxygen and glucose which is carried in blood and these substances are need for respiration. Due to this the rate of respiration for the body cells will be slower. The heart will also have to work harder. It would have to beat harder and more often to get enough glucose and oxygen to the body cells and so increasing number of beats per minute. With the heart having to work hrder and beat more in one minute this may cause heart attacks and stroke.

    how many marks will i get
    i am starting to worry that i answered it incorrectly
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    (Original post by TheMythicalBeast)
    But then again, in the first sugar it decreased at pH 5 and the same enzyme was used for both so it would have decreased, too.
    True.
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    this was really useful, do u have an idea on the what the grade boundaries will be ?
    (Original post by keepyourapology)
    What did y'all put for the question about different number of chloroplasts in the last question?
    (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):
    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):
    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.
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    I will weigh in on this matter. I will go through what I put down in the exam to help any efforts to creating a mark scheme, and then I will go through my predictions of what I think the mark scheme will be like (grade boundaries). If someone can remind me of a question I didn't mention here or a question that had not been mentioned before on this thread, I will share my answers and add them to this post.

    My answers:
    • For the very first question about the differences between the bacteria cells and the shown yeast cell, I wrote about the bacteria cell not having a nucleus - that the chromosomal DNA just 'floats around' in the cytoplasm, I wrote that a bacteria cell can sometimes have a flagella and that the yeast cell did not, that a bacteria cell's wall is not made from cellulose and that a bacteria cell does not have a vacuole but the yeast cell does. This question was 2 marks.
    • For the second question I wrote 'mitochondria'. This was a one mark question.
    • For question three, I wrote down 42, although I now believe this to be incorrect. I believe the answer to be 17 or 21. This was a one mark question (I don't know why there is so much controversy surrounding this one mark!).
    • For question 2a the answer was peristalsis. The exact phrase I wrote was: "peristalsis - a wave of muscle contraction", this was to secure the mark. This was a one mark question.
    • For the disadvantage question I wrote that the food had not been churned by the stomach and that the bacteria had not been killed by the stomach acid. This was a one mark question.
    • For the amylase question I wrote the following: "The amylase, a biological enzyme, will break down the starch in the white bread into simple sugars. White bread is easier to break down than brown bread". This was either a two or a three mark question.
    • For the multi-choice fossils question I selected D. This, obviously, was a one mark question.
    • For the question of why the numbers of species A were lessened I wrote the following: a natural disaster such as an ice age, volcanic eruption or an earthquake could have occurred - destroying the habitat, that the species A might have been competing with other species (namely species C) and that the estimates were based on the fossil records - meaning that gaps or decreases in numbers could be due to the fact that some fossils simply had not been discovered yet or were even there in the first place. I'm pretty sure that this question was a three marker.
    • For the question about bases in amino acids, I multiplied the number given by three (because three bases code for an amino acid) to get an answer in the 1800's (don't remember the number exactly). This was a two mark question.
    • For the question about pentadactyl limbs, I wrote that the two bones above the wrist allow for rotation, and that the pentadactyl limb features five fingers. This question was a two or three marker, and because I had just looked at my watch I realised I didn't have much time left so I rushed it.
    • For the question about the DNA from pea cells, I wrote that the first step was required in order to break open the cells and to release the DNA (by breaking open the nucleus). I didn't actually revise the second part of this question (the part about adding in detergent) so I just made up that you are adding biological enzymes to remove unwanted parts of the cell and to soften the DNA. This was a two mark question.
    • For the question about comparing cells produced by mitosis and meiosis, I wrote that mitosis produces two diploid genetically identical cells, whereas meiosis produces four haploid gamete cells. This was a three mark question.
    • For the first circulatory systems question, I can confirm that the answer was the pulmonary vein. This was a one mark question (I think).
    • For the question immediately after the question above, about how de-oxygenated blood moves from the atrium to the lung, I wrote that it goes through the atrium, a valve, then into the ventricle, and then another valve, and that when the heart beats the valves open and the blood moves in a beat. The blood then moves along the pulmonary artery before reaching the lung. This was either a two or a three mark question.
    • For the first six mark question about the blocking of the coronary arteries, I wrote that they can be blocked by excess cholesterol in the blood, meaning that the muscle cells in the heart can't respire as efficiently, meaning a lower cardiac output. To compensate, the heart has to beat faster, which can cause cardiac arrest or a heart attack, and it could even lead to death. I also wrote that the person who suffered from this would suffer from shortness of breath, and that they would build up an oxygen debt very quickly. Another point is that this could cause the heart to beat irregularly, which may cause a stroke. I also wrote that less blood pumping can limit how much other cells can respire because the heart can't supply them with oxygen quickly enough.
    • For the second six mark question I wrote about how the root hair cells of the plant absorb water through osmosis - because the water molecules move from the area of high concentration (soil) to the area of low concentration (root hair cell) through the root hair cell's partially permeable (cell) membrane. I then wrote about transpiration, and how the evaporation of water in the leaves through the stomata causes water to be pulled up from the xylem, which pulls water from the roots. I then compared this chain of transpiration to sucking on a straw. I also talked about active transport, and how it requires energy from respiration, and how osmosis and transpiration require no energy, but I don't think active transport would be on the mark scheme.
    My predictions:
    • I think that the mark scheme will be quite tough for this exam, meaning lower grade boundaries. This test rewarded those who revised, so people who crammed last minute probably won't get a good mark as they probably didn't go into enough detail and they didn't revise all of the topics. Fortunately for people like us that plan ahead, this means that we will probably get higher grades even though we got lower marks. I am personally quite confident that I definitely got an A, and I'm about 70% sure that I got an A*. This is because in the past, the A* boundary has been as low as 45 (!) in March 2013. The A grade was 40 however, and the B grade was 35. This was a difficult paper. However, the June 2012 paper was really a breeze, and when I did it in a home revision session I scored 55 out of 60 marks. The grade boundary here however was 53 marks for an A*, and 46 for an A. This shows that the boundaries can and will vary, and as this was a harder paper I do think that the boundaries will be lower. One reason I think for this paper being harder than the past two years is because Edexcel may be switching to the new GCSE style paper, so that people next year can do our paper and know to expect something similar (this would explain the weird layout and the copious amounts of suggest questions).
    How do you know the grade boundaries are going to be low?
    • Don't worry, if you are browsing this forum it shows that you actually care about your education and grade. You are probably fine and you will probably get an A or an A*.
    • I guess is that the grade boundaries would be similar to March 2013: A* is 45 marks, A is 40 marks, B is 35 marks, and a C is 30 marks.
    • Phew. That's a lot of text I just typed.
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    (Original post by ca.hardy)
    True.
    Six marker on how the narrowing of coronary arteries affect the functioning of the heart and surrounding body cells.

    i wrote that less blood will be pumped to the body cells due to narrowing of the coronary arteries. The body cells will therefore receive less oxygen and glucose which is carried in blood and these substances are need for respiration. Due to this the rate of respiration for the body cells will be slower. The heart will also have to work harder. It would have to beat harder and more often to get enough glucose and oxygen to the body cells and so increasing number of beats per minute. With the heart having to work hrder and beat more in one minute this may cause heart attacks and stroke.
    how many marks will i get
    i am starting to worry that i answered it incorrectly
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    (Original post by westboy 2016)
    Six marker on how the narrowing of coronary arteries affect the functioning of the heart and surrounding body cells.

    i wrote that less blood will be pumped to the body cells due to narrowing of the coronary arteries. The body cells will therefore receive less oxygen and glucose which is carried in blood and these substances are need for respiration. Due to this the rate of respiration for the body cells will be slower. The heart will also have to work harder. It would have to beat harder and more often to get enough glucose and oxygen to the body cells and so increasing number of beats per minute. With the heart having to work hrder and beat more in one minute this may cause heart attacks and stroke.
    how many marks will i get
    i am starting to worry that i answered it incorrectly
    I wrote the same but I think there was two parts to the question. I think how it affects body cells and the heart. So I talked about a lower stroke volume and decrease in cardiac output too.

    I'm not saying it's wrong but I'm defo sure there was 2parts to the question.
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    (Original post by Mariaaa_)
    this was really useful, do u have an idea on the what the grade boundaries will be ?
    Probably 48 for a* as it was relatively easy but hard too because of the fossils
 
 
 
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