Summary

• What is the formula for magnification?

  Magnification = Size of image / Size of actual object
• How do you convert metres to millimetres?

  Multiply by 1000
• How do you convert millimetres to metres?

  Divide by 1000
• How do you convert micrometres to millimetres?

  Divide by 1000
• How do you convert nanometres to micrometres?

  Divide by 1000
• What are the stages of the cell cycle?

  1. Interphase

  • G1
  • S
  • G2

  1. Mitosis
  2. Cytokinesis
• What is the mass of DNA per cell measured in?

  Arbitrary units
• What is the first stage of mitosis?

  Prophase
• What is the second stage of mitosis?

  Metaphase
• What is the third stage of mitosis?

  Anaphase
• What is the fourth stage of mitosis?

  Telophase
• What follows telophase in the cell cycle?

  Cytokinesis
• What type of cells are used for observing under a microscope?

  Onion cells and cheek cells
• What are the components of a microscope?

  • Eyepiece containing eyepiece lens
  • Objective lenses (3 different magnifications)
  • Lamp or mirror
  • Stage
  • Clips
  • Coarse focusing dial
  • Fine focusing dial
• What is the magnification used for observing onion and cheek cells?

  x 100 magnification
• What is the purpose of the stage micrometre scale?

  To measure the size of specimens
• What is the purpose of the eyepiece graticule scale?

  To measure the field of view
• What is the field of view in microscopy?

  The visible area seen through the microscope
• What is the role of the cell wall?

  To provide structure and support
• What is the function of the cell membrane?

  To regulate what enters and exits the cell
• What is the function of the nucleus?

  To store genetic material