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Biochemistry Objective Questions { Protein Purification }



1. During successful purification scheme, this may be expected that the
A.specific activity increases
B.specific activity decreases
C.number of proteins in the sample decreases
D.both (a) and (c)
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2. In ion-exchange chromatography
A.proteins are separated on the basis of their net charge
B.proteins are separated on the basis of their size
C.proteins are separated on the basis of their shape
D.either (b) or (c)
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3. Which of the following may be added to stabilize the protein after yeast cells disruption?
A.NaCl
B.Protease inhibitor
C.AMP
D.All of these
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4. Gel-filtration chromatography separates on the basis of
A.size and shape using porous beads packed in a column
B.size using porous beads packed in a column
C.shape using porous beads packed in a column
D.none of the above
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5. Affinity chromatography deals with the
A.specific binding of a protein constituents for another molecule
B.protein - protein interaction
C.protein - carbohydrate interaction
D.none of the above
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6. A purified protein sample contains 10 μg of protein and has an enzyme activity of 1 m mole of ATP synthesized/sec (1 unit). What is the specific activity of the final purified sample?
A.1,000 units/mg
B.10,000 units/mg.
C.100,000 units/mg
D.1,000,000 units/mg
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7. Proteins separation can be carried out on the basis of
A.net charge
B.solubility in salt solutions
C.size or mass
D.all of these
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