ANTIBIOTICS QUIZ

S. aerofaciens

S. griseoflavus

S. ramosus

S. griseus

antibiotic yields are generally higher when cells enter the stationary phase

the precursors are often toxic to the cells

antibiotic yields are generally higher when cell growth slows

All of these

calcium penicillin

potassium penicillin

sodium penicillin

penicillin only

Phenyl acetic acid

Ammonium sulphate

Phenyl carbamic acid

Ammonium chloride

organic solvents

ether

all of these

water

both (a) and (b)

aqueous phase

solvent phase

precipitates

8-9

5-6

6-7

7-8

Steptomyces ramosus

Steptomyces aureofaciens

All of these

Nocardia sulphurea

aerobic fermentation followed by anaerobic fermentation

aerobic fermentation

anaerobic fermentation

anaerobic fermentation followed by aerobic fermentation

Mycelial mass increases

pH increase

Both (a) and (b)

Synthesis of penicillin is high