Sizes of Cells

• What should you be able to describe by the end of the video?

  The size of cells
• What prefixes should you be able to use after watching the video?

  CTI, milli, micro, and nano
• Why might the material seem tricky?

  You may need to watch the video multiple times
• What are the two types of cells discussed in the previous video?

  Eukaryotic and prokaryotic cells
• How do prokaryotic cells compare in size to eukaryotic cells?

  Prokaryotic cells are much smaller
• What is the standard unit of measurement in science?

  The meter
• How is 1 meter divided to find centimeters?

  Into 100 equal parts
• What does the prefix "centi" mean?

  One hundredth
• What is 1 centimeter in standard form?

  1 * 10^-2 m
• What is the average length of a German shepherd?

  Around 1 meter
• How is 1 centimeter divided to find millimeters?

  Into 10 equal parts
• What does the prefix "milli" mean?

  One thousandth
• What is 1 millimeter in standard form?

  1 * 10^-3 m
• How long is 1 meter in millimeters?

  1,000 millimeters
• What is the smallest unit discussed for measuring cell parts?

  Nanometer
• What does the prefix "nano" mean?

  One billionth
• What is 1 nanometer in standard form?

  1 * 10^-9 m
• What is the diameter of a hemoglobin molecule?

  Around 5 nanometers
• What are the key units of measurement for cell sizes?

  • Centimeter (1 cm = 1 * 10^-2 m)
  • Millimeter (1 mm = 1 * 10^-3 m)
  • Micrometer (1 µm = 1 * 10^-6 m)
  • Nanometer (1 nm = 1 * 10^-9 m)
• How do the sizes of cells and their components compare?

  • Prokaryotic cells are smaller than eukaryotic cells.
  • Typical human cells are 10-20 micrometers.
  • Ribosomes and proteins are measured in nanometers.