What are the defining characteristics of the exponential/log phase of the bacterial growth curve.  Explain the culture conditions that arise that cause the phase to end.   In different culture media, and the exact same starting inoculum, will the end of exponential/log occur at the same time?  Why or why not?  A graph or a drawing of the growth curve would help but is not essential to answer this question.

Tom streak plated an Unknown bacterium on Monday. On Wednesday, her plate showed a continuous streak of growth in two colors, but no distinct single colonies. List two possible reasons for these observations and why they may have affected the streak.

The graph represents the growth rates of different types of bacteria labeled w-z at different temperatures. -10 0 10 20 30 40 50 60 70 80 90 100 110 Temperature (°C) Lactic acid bacteria are type x. They are used in the preparation of fermented food products. What will be the impact on the lactic acid bacteria when the temperature is increased to 60°C? O These bacteria will become type y. O These bacteria will work more effectively. O These bacteria will work at the same speed. O These bacteria will stop fermenting food. Growth Rate of Bacteria

In growing E.coli, why is that (reasons) they do not grow after doubling time under 20 degrees celsius and under 37 degrees celsius, the number of colonies after doubling time has decreased? provide reliable sources (links).