It is sometimes difficult to obtain pure cultures of microbes that grow naturally in mixed communities. True or False ?

A chemostat creates a constant flow of fresh nutrients and waste removal for industrial use of bacteria. True False

1)describe how you can use an ‘agar deep’ to learn more about an unknown microbe. These are sometimes also called ‘semi-solid deeps’.

Which of the following would you expect if you let surfaces stay wet for 5 minutes instead of 10 minutes?   A A smaller percentage of the microbes would be killed.   B Time does not play a role in how successful a disinfectant treatment is, so a 5 minute application will kill the same percent of the total population as a 10 minute application.   C The germicide would remove just as many total microbes; 10 minutes is definitely more time than is necessary.