1.1 observing cells

• Steps to observe an object using a microscope

  1. Move the stage to its lowest position

  2. Place the object you want to observe on the stage

  3. Select the objective lens with the lowest magnification

  4. Look through the eyepiece and turn the coarse-focus knob slowly until you see your object

  5. Turn the fine-focus knob until your object comes into focus

  6. Repeat Steps 1 to 6 using an objective lens with a higher magnification to see the object in greater detail
• Living organisms

  Made of cells
• Cells

  • The building blocks of life
  • The smallest units found in an organism
• Organisms

  • Bacteria
  • Person
• Cells joining together

  Millions of cells can join together to form a person
• Cells were first seen

  350 years ago
• Cells

  Tiny roomlike structures
• Robert Hooke, a scientist, looked down a microscope at a thin slice of cork and saw the cells
• The cells Hooke saw were plant cells, as cork is a type of tree bark