Microbial cell recovery is carried out in a continuous disc-stack centrifuge. The centrifuge is operated at 5000 rpm for separation of baker's yeast. At a feed rate of 60 1/min, 50% of the cells are recovered. At constant speed, solid recovery is inversely proportional to flow rate. What flow rate is required to recover 90% of cells if the centrifuge speed is fixed at 5000 rpm? 

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#Question id: 141

#Section 2: General Biology

At the isoelectric pH of an amino acid which has two pKa values the net charge is

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#Question id: 142

#Section 2: General Biology

Histidine has pKa values of 1.8, 6.0 (R-group) and 9.3 . At pH 8.0, the net charge on histidine is

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#Question id: 144

#Section 2: General Biology

The pKaʹs of arginineʹs α-Carboxyl group, α-Amino group and side chain are 1.8, 9.0 and 12.5, respectively. Calculate the isoelectric point.

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#Question id: 145

#Section 2: General Biology

The pKaʹs of isoleucineʹs α-Carboxyl group and α-Amino group are 2.3 and 9.8, respectively. Calculate the isoelectric point.

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#Question id: 146

#Section 2: General Biology

The pH inside cells is normally near pH 7. At pH 7 which statement is true about the charges (ionization state) of the α-Carboxyl and α-Amino groups of an amino acid?

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#Question id: 147

#Section 2: General Biology

Which structure below is appropriate for glycine at neutral pH?