16. A psychrophilic halophile would be a microbe that prefers

A. cold temperatures and increased amounts of salt
B. warm temperatures and increased amounts of pressure
C. cold temperatures and the absence of oxygen
D. warm temperatures and increased amounts of acid

17. NaCl can act as

A. antagonist at optimal concentrations
B. synergistically if added in excess of optimum level
C. Both (a) and (b)
D. None of the above