21. The reproduction by budding occurs in

A. Rhodopseudomonas acidophila
B. Hyphomicrobium Vulgare
C. Bacillus subtilis
D. Both (a) and (b)

22. Starvation proteins are produced by culture during which of the following segments of the growth curve?

A. Lag phase
B. Exponential phase
C. Stationary phase
D. Death phase

23. The cell reproduction in bacteria may occur by

A. binary fission
B. budding
C. fragmentation
D. all of these

24. During exponential growth, the growth rate is

A. number of generations per unit time
B. reciprocal of generation time
C. both (a) and (b)
D. none of these

25. A spore differs from an actively replicating bacterium in that the spore

A. is produced during a process involving asymmetric division
B. is able to withstand more extreme conditions than the replicating cell
C. is metabolically inactive
D. all of the above