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11. Which of the following organism(s) produce(s) tetracycline?

A. Streptomyces aureofaciens
B. Steptomyces ramosus
C. Nocardia sulphurea
D. All of these

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12. Media used for the production of chlortetracycline consists of

A. sugar, corn steep liquor, CaCO₃, (NH₄)₂SO₄and NH₄Cl
B. corn steep liquor, CaCO₃and (NH₄)₂SO₄
C. sugar, CaCO₃and (NH₄)₂SO₄
D. corn steep liquor, CaCO₃, (NH₄)₂SO₄and NH₄ Cl

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13. Which of the following precursor is added in the medium to get penicillin G?

A. Phenyl carbamic acid
B. Phenylacetic acid
C. Ammonium sulfate
D. Ammonium chloride

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14. High yield of chlortetracycline requires

A. no aeration
B. continuous aeration
C. aeration which does not affect the yield
D. controlled aeration

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15. Streptomycin is produced by

A. S. griseus
B. IS. griseofulvin
C. S. aureofaciens
D. S. ramosus

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