A two-stage chemostat system is used for production of secondary metabolite. The volume of each reactor is 0.5 m³; the flow rate of feed is 50 l h^{- 1}. Mycelial growth occurs in the first reactor; the second reactor is used for product synthesis. The concentration of substrate in the feed is 10 gl^-1. Kinetic and yield parameters for the organism are:

                                                            

Assume that product synthesis is negligible in the first reactor and growth is negligible in the second reactor. Determine cell concentrations entering the second reactor.

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#Question id: 10965

#I Life Science/ Life Sciences Group – I-V

Which of the following is a TRUE statement?

#Question id: 10966

#I Life Science/ Life Sciences Group – I-V

A couple requests blood typing of their 2-year-old child (father AB, Rh-negative; mother B, Rhnegative). Results of hemagglutination assays of the child’s blood are shown in the next figure. Which of the following conclusions concerning the child’s parentage is valid?

#Question id: 10967

#I Life Science/ Life Sciences Group – I-V

A 21-year-old female, blood type B, is undergoing surgery. Her platelet count is 75,000/μl. She will need platelet infusions before and during surgery. Which of the following blood types would be used to collect platelets that are compatible with the patient?

#Question id: 10968

#I Life Science/ Life Sciences Group – I-V

Which of the following is TRUE concerning erythroblastosis fetalis (hemolytic disease of the newborn, HDN)?

#Question id: 10969

#I Life Science/ Life Sciences Group – I-V

Which of the following will result in a transfusion reaction? Assume that the patient has never had a transfusion.

#Question id: 10970

#I Life Science/ Life Sciences Group – I-V

A mother of blood type A+ who has always been perfectly healthy just delivered her second child. The father is of blood group O−. Knowing that the child is of blood group O− (O, Rh−), what would you expect to find in this child?