AS level biology

Subdecks (31)

Cards (1570)

  • What type of beam does a light microscope use?
    A beam of light
  • What type of images can light microscopes see?
    Colour images
  • Why is the resolution power of light microscopes lower?
    Because they use a longer wavelength
  • Can light microscopes observe live specimens?
    Yes
  • How does the magnification of light microscopes compare?
    It is lower
  • What type of beam does an electron microscope use?
    A beam of electrons
  • What type of images can electron microscopes see?
    Black and white images
  • Why must specimens be dead for electron microscopy?
    Because electron microscopes cannot observe live specimens
  • How does the resolution power of electron microscopes compare to light microscopes?
    It is higher
  • How does the magnification of electron microscopes compare?
    It is higher
  • What advantages do electron microscopes have over light microscopes?
    Higher magnification and resolution
  • What is the calibration process for microscopes?
    1. Identify eyepiece units to stage micrometre units.
    2. Start from zero at the same point.
    3. Multiply eyepiece unit by divisions (0.1/0.01).
    4. Ensure each unit is the same.
  • What is the first step in calibration for microscopes?
    Identify eyepiece units to stage micrometre units
  • Why is it important to start from zero in calibration?
    To ensure accurate measurement comparison
  • If you have 1 eyepiece unit, how do you convert it to stage micrometre units?
    Multiply by the divisions between eyepiece
  • What must be ensured when calibrating units?
    Each unit must be the same
  • How do you convert from µm to mm?
    Divide by 1000
  • How many millimeters are in a meter?
    1000 mm
  • What is the conversion of 1 mm to meters?
    0.001 m
  • How is 1 µm expressed in terms of mm?
    1 mm ÷ 1000
  • How many millimeters are in a centimeter?
    10 mm
  • What is the conversion factor from mm to nm?
    Multiply by 1,000,000
  • What are the key metric conversions mentioned?
    • 1 m = 1000 mm
    • 1 mm = 0.001 m
    • 1 µm = 1 mm ÷ 1000
    • 1 cm = 10 mm
    • mm to nm = x1000000
  • Aerobic respiration produces ATP from glucose using oxygen as an electron acceptor.
  • The mitochondria is the site of aerobic respiration