Bacterial division

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

  The number of bacteria in a population
• What type of students is this material intended for?

  Biology triple students
• What are bacteria classified as?

  Prokaryotes
• How is bacterial genetic information organized?

  It is not enclosed in a nucleus
• What is the process by which bacteria multiply?

  Binary fission
• How often can bacteria undergo binary fission?

  Every 20 minutes
• What conditions are necessary for rapid bacterial growth?

  Enough nutrients and suitable temperature
• How do you calculate the number of bacteria after a certain time?

  Use the equation $N =$$2^n$
• What does $N =$$2^n$ represent in bacterial growth?


  N is the number of bacteria after division
• How many minutes are in three hours?

  180 minutes
• How many rounds of division occur in three hours?

  9 rounds of division
• What is the number of bacteria after three hours?

  512 bacteria
• How do you express 512 in standard form?

  5.12 × 10²
• How many minutes are in eight hours?

  480 minutes
• How many rounds of division occur in eight hours?

  24 rounds of division
• What is the number of bacteria after eight hours?

  16,777,216 bacteria
• How do you express 16,777,216 in standard form?

  1.6787216 × 10⁷
• How many decimal places should the standard form be rounded to?

  Three decimal places
• What are the steps to calculate the number of bacteria after a certain time?

  1. Determine the total time in minutes.
  2. Divide the total time by the division time (20 minutes).
  3. Use the formula $N =$$2^n$ to find the number of bacteria.
  4. If required, convert the result to standard form.
• What factors affect bacterial growth rates?

  • Availability of nutrients
  • Suitable temperature
  • Time of division (every 20 minutes)