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
• Why are objects in biology often measured in smaller units?

  Because they are often much smaller than a meter
• What is the average length of a German shepherd?

  Around 1 meter
• What does the prefix "centi" mean?

  One hundredth
• How many centimeters are in 1 meter?

  100 centimeters
• What is the standard form of 1 centimeter?

  1 * 10^-2 meters
• What is the width of a little finger approximately?

  Around 1 centimeter
• What does the prefix "milli" mean?

  One thousandth
• How many millimeters are in 1 centimeter?

  10 millimeters
• What is the standard form of 1 millimeter?

  1 * 10^-3 meters
• How long is a dog in millimeters if it is 1 meter long?

  1,000 millimeters
• What does the prefix "micro" mean?

  One millionth
• How many micrometers are in 1 meter?

  1,000,000 micrometers
• What is the standard form of 1 micrometer?

  1 * 10^-6 meters
• What is the typical size range of a human cell?

  10 to 20 micrometers
• Why do biologists find micrometers useful?

  They are useful for measuring cell sizes
• What is the smallest unit discussed for measuring objects inside cells?

  The nanometer
• What does the prefix "nano" mean?

  One billionth
• How many nanometers are in 1 meter?

  1,000,000,000 nanometers
• What is the standard form of 1 nanometer?

  1 * 10^-9 meters
• How large is a molecule of hemoglobin?

  Around 5 nanometers in diameter
• What type of cells are proteins and cells measured in?

  Measured using nanometers
• What are the prefixes used for measuring small sizes in biology?

  • CTI (centi): 1/100
  • Milli: 1/1000
  • Micro: 1/1,000,000
  • Nano: 1/1,000,000,000
• What are the differences in size between the units discussed?

  • 1 meter = 100 centimeters
  • 1 centimeter = 10 millimeters
  • 1 millimeter = 1,000 micrometers
  • 1 micrometer = 1,000 nanometers