Question

True or False: The doubling time of Bacillus subtils is 2 hours. Beginning with 10³ cells, the population after 2 days of exponential growth will be over 200 million cells. Explain your by showing your work.

and

1. Which reaction is catalyzed by bacteria during microbial leaching of low grade copper pyrite ores?
   1. CuS + 2O₂ à Cu²⁺ + SO₄^2-
   2. CuS + 8Fe³⁺ + 4H₂O à Cu²⁺ + 8Fe²⁺ + SO₄^2- + 8H⁺
   3. Fe⁰ + Cu²⁺ à Fe²⁺ + Cu⁰
   4. 4Fe²⁺ + O₂ + 4H⁺ à 4Fe³⁺ + 2H₂O

Answer 1

Answer is True

Because example E.coli bacteria for every 20 minutes becomes double and mainly doubling time we can calculate specific growth rate of bacteria and total time for taking we have to plot growth curve ,Lag phase,Log phase, stationery phase ,Death phase.

Based on doubling time Nn=N02n

Based this formula we can calculate bacterial growth and doubling time .n means = number of cells generation

N0= intial cell generation

n = generation

Answer is second Reaction:

CuS + 8Fe3+ + 4H2O à Cu2+ + 8Fe2+ + SO42- + 8H+