1. Which of the following was the first amino acid to be produced commercially?

A. L-glutamic acid
B. L-lysine
C. L-cystine
D. L-methionine

2. The Candida species require fermentation equipment lined with plastic because they are extremely sensitive to

A. traces of cobalt
B. traces of nickel
C. traces of iron
D. none of these

3. Cycloserine may be isolated from the cultures of

A. S. orchidaceous
B. S. lavendulae
C. S. garyphalus
D. All of these

4. The first penicillin isolated by Alexander Fleming, penicillin F is also called

A. 2-Pentenyl Penicillin
B. n-heptyl penicillin
C. phenoxymethylpenicillin
D. benzylpenicillin

5. It is mandatory that cultures and fermentation residues be sterilized before discard in case of Eremothecium ashbyii and Ashbya gossypii because they are

A. plant pathogens
B. human pathogens
C. plant mutants
D. none of these