Sizes of Cells

• What prefixes should you be able to use after watching the video?

  CTI, milli, micro, and nano
• What is the standard unit of measurement in science?

  The meter
• How is 1 centimeter expressed in standard form?

  1 cm = $1 \times 10^{-2} \text{ m}$
• What is the relationship between centimeters and millimeters?

  1 cm equals 10 mm
• How is 1 millimeter expressed in standard form?

  1 mm = $1 \times 10^{-3} \text{ m}$
• What does the prefix "micro" mean?

  One millionth
• How is 1 micrometer expressed in standard form?

  1 µm = $1 \times 10^{-6} \text{ m}$
• What is the smallest unit discussed for measuring sizes inside cells?

  Nanometer
• What does the prefix "nano" mean?

  One billionth
• How is 1 nanometer expressed in standard form?

  1 nm = $1 \times 10^{-9} \text{ m}$
• Why is the nanometer a useful unit in biology?

  It measures proteins and cellular components
• What are the key prefixes used to describe sizes in biology?

  • Centi (1/100)
  • Milli (1/1000)
  • Micro (1/1,000,000)
  • Nano (1/1,000,000,000)
• How do scientists typically express measurements in biology?

  • Use standard form for clarity
  • Convert to appropriate prefixes
• What are the relationships between the different size units in biology?

  • 1 m = 100 cm
  • 1 cm = 10 mm
  • 1 mm = 1,000 µm
  • 1 µm = 1,000 nm