TRIPLE-bacteria growth

• how does bacteria reproduce?

  Binary fission.

  • Replication of DNA. The bacterium uncoils and replicates its chromosome, essentially doubling
  • After copying the chromosome, the bacterium grows larger in preparation for binary fissions, the two strands migrate to opposite poles of the cell.
  • The cell elongates with a septum forming at the middle. The two chromosomes are also separated in this phase.
  • new cell wall is formed and the cell splits at the centre, dividing the parent cell into two new daughter cells. Each daughter cell contains a copy of the nuclear materials as necessary organelles.
• what conditions are needed for bacteria to grow?

  Moisture, warmth, nutrients, and time.
• how do you calculate the area of the inhibition zone?

  PIE x radius ^2
• how to calculate bacteria of a population?

  A future population of bacteria can be estimated by multiplying the current population by two for every mean division time (time it takes for the bacteria to divide) that passes
• example

  The mean division time for bacteria population A is 20 minutes. If the observation begins with one bacterium, calculate how many bacteria will be present after six hours.

  Part 1 – Calculate how many times the bacteria divide in six hours

  the bacteria divide every 20 minutes, and will therefore divide three times every hour, 60/20 = 3.

  If the bacteria grow for six hours, each bacterium will divide 3 times per hour × 6 hours = 18 times.
• what is the formula to calculate number of bacteria in a population?

  bacteria at beginning of growth x 2 ^number of divisions