11. The time in minutes in which 90% of the bacterial population will be killed at a given temperature is called the
a. generation time.
b. thermal death time.
c. sterilization time.
d. decimal reduction time.

12. The food preparation process in which not all microorganisms are killed, but the number of microbes capable of spoiling the food or causing disease is reduced, is called
a. sanitation.
b. pasteurization.
c. disinfection.
d. purification.

13. A toxic, odorless gas often used as a sterilizing agent in hospitals and dental officials is
a. ethylene oxide.

b. carbon dioxide.
c. carbon monoxide.
d. propane.