One type of bacteria reproduces once every 60 minutes. If there are 2 bacterial cells to begin with, then after 4 hours there will be a total of _____ bacterial cells.
Answer: Solving by the method of exponential growth. bacteria = 2 after one hr = 2² = 4 after 2nd hr = 2³ = 8 after 3rd hr = 2⁴ = 16 after 4th hr = 2⁵ = 32
