A researcher is analyzing the immune response of a patient following the patientʹs exposure to an unknown agent while out of the country. The patientʹs blood is found to have a high proportion of lymphocytes with CD8 surface proteins. What is the likely cause?

#Question id: 3049

#Unit 2. Cellular Organization

E. coli cells typically make most of their ATP by metabolizing glucose. Under the conditions of this experiment, what should be true of E. coliʹs generation time

#Question id: 3050

#Unit 2. Cellular Organization

Agar is well suited as a solidifying agent because

A. it has been melted in boiling water

B. it can be cooled to about 40 to 42°C before hardening

C. it will not melt again until the temperature rises to about 80 to 90°C.

D. most microorganisms cannot degrade it.

#Question id: 3051

#Unit 2. Cellular Organization

You have 10^10 cell/L of bacterial stock solution. To prepare 1 liter of growth medium containing 1000 bacteria, the volume in microlitre of this stock solution that should be added is

#Question id: 3052

#Unit 2. Cellular Organization

How many average CFU will form on petriplate if 0.1ml sample plating from 104 diluted sample (original sample contain 3x10^7 bacteria per ml)

#Question id: 3053

#Unit 2. Cellular Organization

Bacterial culture contains 1000/ mL in the exponential growth phase. If you consider a generation time of 20 minutes, the total number of organisms / mL 60 minute will be

#Question id: 3054

#Unit 2. Cellular Organization

A pure culture in exponential growth phase has a bacterial concentration of 6.4 x 10^8 cells/ml. If the bacterium has a generation time of 1 h, how long ago was the cell concentration 8.0 x 10^7 cells/ml?