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    Does anyone have the actual paper?
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    I will have to log in and get it from aqa. Private message for paper.
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    how would i get A* in biology?
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    (Original post by adam_williams)
    how would i get A* in biology?
    Master the exam technique and then learn everything you need to know. Obviously it's much easier said than done, but from past papers, older students and teachers you should be able to learn the exam technique and then learning the facts just comes down to revision: mark schemes, classwork, the specification etc are all good sources
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    (Original post by aaminahm)
    I thought the first one was glucose😓😓😓😓😓


    Posted from TSR Mobile
    I don't think it's the 2017 paper
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    The first question on B3 was, Starch with an arrow saying 'Amylase', so the answer is Glucose not Glycerol
    (Original post by neon_reaper)
    Updated for better presentation --- There are definitely some questions missing from 2 and 3, can anyone remember them? Also if you found this helpful, some rep would be appreciated (bottom left)

    Question 1 [9]
    Spoiler:
    Show

    • What are lipids broken down into? [1]
    Glycerol (Tick Box)

    • Two control variables [2]
    Time interval of 2 minutes, volume of milk/water/bile/lipase solution

    • Where is lipase produced? [1]
    Pancreas, small intestine

    • Why did the pH decrease? [2]
    The milk was digested into fatty acid and glycerol, so the fatty acid reduced the pH

    • What evidence is there that bile helped the lipase? [1]
    The pH dropped faster with bile than with water

    • Why did they both end up on the same pH? [2]
    All of the fat in the milk had been digested so the same volume of fatty acid had been produced in each beaker, therefore they ended on the same pH which could not go any lower as no more fatty acid could be produced


    Question 2 [6]
    Spoiler:
    Show

    • Tape Measure, Light Intensity Meter and Ruler Question - The tape measure would be used as a transect line from the light area to the dark area to measure the distribution. At regular intervals such as every 2m, measure the length of the ivy leaves near to the transect using the ruler (measure from the same points on each leaf to keep results valid). Also measure the light intensity using the light meter. Repeat this at every interval and the results can then be used to test the hypothesis. To makethe results more valid, the transect can be done 3 times in different areas to increase the sample size


    Question 3 [6]
    Spoiler:
    Show

    • Runners question - you had to look at the graphs at the values for the runner at the very end of the exercise and put the values into the box [2?]

    • Main reason runner 1 had a higher cardiac output? [?]
    Person 2 had a much lower stroke rate (volume of blood leaving heart)

    • Explain why Runner 1 could run faster [4]
    His heart rate and the amount of blood being pumped was higher, so more oxygen and glucose could get to the muscle cells so they could do more respiration and would therefore have more energy, allowing them to contract and relax more to bring about more movement, therefore he was able to run faster


    Question 4 [10]
    Spoiler:
    Show

    • Where is DNA found in a cell? [2]
    In the nucleus, wound up tightly as chromosomes

    When a cell undergoes mitosis and splits, the two daughter cells have the same genetic material, explain how [2]
    Chromosomes duplicate before cell splits, so each daughter cell receives the same, full set of chromosomes

    • A plant needs energy to make glucose. Where does it get this energy from? [2]
    It gets the energy from the sun in the form of light: the chlorophyll in the mesophyll cells traps the light. (No idea what gains the second mark)

    • What does a plant use glucose for other than respiration? [4?]
    Cellulose, stored as insoluble fats and oils, stored as insoluble starch/in storage organs, used with nitrate ions to make amino acids and proteins


    Question 5 [7]
    Spoiler:
    Show


    (Muscle cell in the stomach with the mitochondria diagram)
    • what is the function of mitochondria? [2]
    Respiration to provide the rest of the cell with energy

    • Function of a ribosome? [1]
    Making/synthesising proteins

    • A ribosome cannot be seen through the light microscope, suggest why? [1]
    Ribosome is too small – higher magnification needed

    • What is the function of the muscle cells? [2]
    The cells work together as a tissue(muscle) to contract and relax in order to bring about movement and churn the food in the stomach

    • The measurement, magnifying question [1]
    400

    Question 6 [10?]
    Spoiler:
    Show


    • Archaeopteryx (dinosaur bird) – Suggest how this fossil was preserved. [?]
    Died and buried by sediments which created anoxic conditions meaning that microorganisms could not decay the body as they could not respire. Conditions for decay were not present. The organic/soft parts deteriorated but the hard parts (the bones) were infilled by sediments over time and thus preserved.

    • Suggest why the fossil record is incomplete [2]
    Fossils destroyed by geological activity. Conditions required for fossilization rarely occur therefore few organisms are ever fossilized.

    • Speciation from archaeopteryx [4]
    Single population of ancestor specieswas split up and isolated into multiple populations by a geographical barrier.Natural selection took place so in each population the most suitable genes werepassed on however because each population experienced different environments,different genes were passed on. This happened repeatedly until successful interbreeding was no longer possible.


    Question 7 [8]
    Spoiler:
    Show

    • Mendel and pea plants
    Ratio was 3.15:1 or 3:1. [1]

    Tick boxes: homozygous, homozygous,heterozygous [3?]

    • Why was Mendel's theory not accepted by scientists? [2]
    He was a monk not a scientist (noscientific credibility). Genes, DNA, chromosomes etc had not been discovered. He published his results in an obscure journal.

    •Cystic and poly
    1 copy of allele need for polydactyl, 2 copies needed for cystic fibrosis [1]
    • The stupid robber who left his fingerprints [1]
    B




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    i thought question 2 was about ph level not light intensity ?!?!?!
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    (Original post by archibald300)
    The first question on B3 was, Starch with an arrow saying 'Amylase', so the answer is Glucose not Glycerol
    (Original post by Wei.lee)
    i thought question 2 was about ph level not light intensity ?!?!?!
    Guys check the post date, this is from 2 years ago
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    Haha yh thanks I realised. I felt like such a dummy afterwards lol

    (Original post by neon_reaper)
    Guys check the post date, this is from 2 years ago
 
 
 
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