An extract of rat liver was prepared by homogenizing 65 g of tissue in 55 mL of buffer (Fraction 1). This extract was assayed for Enzyme X activity. The total activity of Enzyme X in Fraction 1 was 5,650 units and its specific activity was 11.5 units/mg. Fractionl was then passed down an ion-exchange column and the bound proteins were eluted using increasing concentrations of NaCl. The fractions from the column were assayed for activity of Enzyme X. The fractions containing activity were pooled to give a total volume of 6.5 mL (Fraction 2) The total activity of Enzyme X in Fraction 2 was 4,162 units and the specific activity was 75.5 units/mg. a) What is the % Yield of the ion exchange step? b) What is the Fold purification of the ion exchange step?

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An extract of rat liver was prepared by homogenizing 65 g of tissue in 55 mL of buffer
(Fraction 1). This extract was assayed for Enzyme X activity. The total activity of Enzyme X
in Fraction 1 was 5,650 units and its specific activity was 11.5 units/mg. Fraction1 was then
passed down an ion-exchange column and the bound proteins were eluted using increasing
concentrations of NaCl. The fractions from the column were assayed for activity of Enzyme
X. The fractions containing activity were pooled to give a total volume of 6.5 mL (Fraction
2) The total activity of Enzyme X in Fraction 2 was 4,162 units and the specific activity was
75.5 units/mg.
a) What is the % Yield of the ion exchange step?
b) What is the Fold purification of the ion exchange step?
Transcribed Image Text:An extract of rat liver was prepared by homogenizing 65 g of tissue in 55 mL of buffer (Fraction 1). This extract was assayed for Enzyme X activity. The total activity of Enzyme X in Fraction 1 was 5,650 units and its specific activity was 11.5 units/mg. Fraction1 was then passed down an ion-exchange column and the bound proteins were eluted using increasing concentrations of NaCl. The fractions from the column were assayed for activity of Enzyme X. The fractions containing activity were pooled to give a total volume of 6.5 mL (Fraction 2) The total activity of Enzyme X in Fraction 2 was 4,162 units and the specific activity was 75.5 units/mg. a) What is the % Yield of the ion exchange step? b) What is the Fold purification of the ion exchange step?
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