In batch culture, protogon is produced from peptone during the stationary phase with a yield of 0.4 protogon mg per g of peptone. If it is to be produced in a chemostat at a dilution rate of 0.5 h-1 from a medium containing 10 g.l-1 of peptone, then the rate of protogon synthesis would be

• 0 g.l-1h-1
• 0.5 g.l-1h-1
• 1 g.l-1h-1
• 2 g.l-1h-1