31. Which of the following are commercially used for bacterial amylases production?

A. Bacillus subtilis
B. Bacillus diastaticus
C. Clostridium acetobutylicum
D. Both (a) and (b)

32. An “International Unit” of penicillin activity established in 1944 is the amount of penicillin equivalent to

A. 0.6 micrograms of crystalline penicillin G of about 98% purity
B. 0.6 micrograms of crystalline penicillin F of about 98% purity
C. 0.8 micrograms of crystalline penicillin G of about 98% purity
D. 0.8 micrograms of crystalline penicillin G of about 90% purity

33. The man who first discovered the chemical that causes souring of milk was

A. Pasteur
B. Scheele
C. Watson
D. Ronald Ross

34. Which of the following is not penicillin?

A. Penicillin G
B. Penicillin X
C. Penicillin V
D. Penicillin Y

35. Which of the following is a cephalosporin?

A. Cephalosporin N
B. Synnematin
C. Cephalosporin C
D.  All of these