1aTo measure the number of viable cells in a culture the bes

1a.To measure the number of viable cells in a culture, the best method to use is:
   optical density
   flow cytometry
   colony counting
   microscope cell count
   none of these

1b.In which phase of growth do cells reach a maximal growth rate?
   lag phase
   exponential phase
   stationary phase
   germination
   sporulation

1c.What kind of bacteria can live comfortably as a symbiont with humans?
   psychrophile
   thermophile
   halophile
   mesophile
   piezophile

Solution

1b. Maximum growth rate observed in Log or Exponential phase. Here the growth rate is in Geometric manner due to abundance of nutrients and environment.

1c. Answer is Mesophile. Mesophilic organisms are those in which they grow in Moderate temperature I.e from 20 to 40 C

1a. Flowcytometry is a LASER based biophysical technique used for cell sorting, cell counting and also for viability assays