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Could You Pass A-Level Science?

If A-level science existed and involved answering just 12 multiple-choice questions.

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  1. 1. This diagram shows DNA replication. What is the name of the labelled enzyme?

    AQA / filestore.aqa.org.uk
    Correct
    Incorrect
    DNA polymerase
    Correct
    Incorrect
    DNA helicase
    Correct!
    Wrong!

    DNA helicase splits the two strands by breaking hydrogen bonds, then DNA polymerase goes along the strand making complimentary base pairs.

  2. 2. These photos show different stages of the cell cycle. Which is the correct order?

    filestore.aqa.org.uk
    Correct
    Incorrect
    D A C B E
    Correct
    Incorrect
    D C B E A
    Correct
    Incorrect
    D B E C A
    Correct!
    Wrong!

    The five stages of the cell cycle are interphase, prophase, metaphase, anaphase, telophase.

  3. 3. This is a plant cell. What is the name of the organelle labelled "W"?

    filestore.aqa.org.uk
    Correct
    Incorrect
    Endoplasmic reticulum
    Correct
    Incorrect
    Nucleus
    Correct
    Incorrect
    Chloroplast
    Correct!
    Wrong!

    It's a chloroplast, responsible for photosynthesis.

  4. 4. What is the name of the organelle labelled "Z"?

    Correct
    Incorrect
    Nucleus
    Correct
    Incorrect
    Mitochondiron
    Correct
    Incorrect
    Golgi apparatus
    Correct!
    Wrong!

    It's the nucleus, where the cell's genetic information is held.

  5. 5. Which atom has the largest atomic radius?

    Correct
    Incorrect
    Correct
    Incorrect
    Correct
    Incorrect
    Correct!
    Wrong!

    Atomic radius is a measure of the distance from the nucleus of an atom to the boundary of its electron cloud. Atomic radius increases as you go down the periodic table, adding electron shells to atoms, but decreases as you go across the periodic table and nuclear charge increase, pulling electrons in closer to the nucleus. Na (sodium) atoms have the largest atomic radius in the third row of the periodic table.

  6. 6. How many electrons can an S orbital hold?

    commons.wikimedia.org
    Correct
    Incorrect
    1
    Correct
    Incorrect
    2
    Correct
    Incorrect
    3
    Correct!
    Wrong!

    Just two.

  7. 7. What does the term "structural isomers" mean?

    Correct
    Incorrect
    Compounds that have the same chemical formula but different structural formula.
    Correct
    Incorrect
    Compounds that have the same chemical formula and structural formula, but a different configuration in 3D space.
    Correct!
    Wrong!

    The other description refers to stereoisomers.

  8. 8. Which of these statements is true about ethanal?

    UAwiki / CC / commons.wikimedia.org
    Correct
    Incorrect
    It reacts with Tollens’ reagent to form silver.
    Correct
    Incorrect
    It has a higher boiling point than ethanol.
    Correct
    Incorrect
    Its empirical and molecular formulas are different.
    Correct!
    Wrong!

    Ethanal, also known as acetaldehyde, is an aldehyde – and aldehydes react with Tollens' reagent to make silver.

  9. 9. What phenomenon can be used to demonstrate the wave properties of electrons?

    Correct
    Incorrect
    Photoelectric effect
    Correct
    Incorrect
    Electron diffraction
    Correct!
    Wrong!

    You wouldn't see an interference pattern in Young's double slit experiment if electrons didn't behave like waves.

    Via Jordgette / en.wikipedia.org
  10. 10. Which of the following sentences about gravitational potential is true?

    NASA / en.wikipedia.org
    Correct
    Incorrect
    Gravitational potential can have a positive value.
    Correct
    Incorrect
    The gravitational potential at the surface of the Earth is zero.
    Correct
    Incorrect
    The gravitational potential gradient at a point has the same numerical value as the gravitational field strength at that point.
    Correct!
    Wrong!

    Gravitational potential is always negative, and at the Earth's surface is -63 MJ kg-1.

  11. 11. In astronomy, what is a standard candle?

    Correct
    Incorrect
    An object whose absolute magnitude is known.
    Correct
    Incorrect
    An object whose absolute magnitude is constant.
    Correct
    Incorrect
    An object whose apparent magnitude is constant.
    Correct!
    Wrong!

    Cepheid variables and Type 1A supernova are standard candles.

  12. 12. Which of the following is NOT a reason to use ultrasound rather than X-rays when scanning an unborn foetus?

    BruceBlaus / CC / commons.wikimedia.org
    Correct
    Incorrect
    Ultrasound is non-ionising so less likely to cause harm.
    Correct
    Incorrect
    Ultrasound gives good images of soft tissue.
    Correct
    Incorrect
    Ultrasound gives a better resolution image.
    Correct!
    Wrong!

    X-rays show more detail than ultrasound scans.

Questions adapted from Biology, Chemistry and Physics AQA past papers and A-Level revision guides.

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