Protein Purification(Biochemistry ) Questions and Answers

Question 1. During successful purification scheme, this may be expected that the
  1.    number of proteins in the sample decreases
  2.    specific activity increases
  3.    specific activity decreases
  4.    both (a) and (c)
Explanation:-
Answer: Option D. -> both (a) and (c)
Question 2. Affinity chromatography deals with the
  1.    None of these
  2.    protein - carbohydrate interaction
  3.    protein - protein interaction
  4.    specific binding of a protein constituents for another molecule
Explanation:-
Answer: Option D. -> specific binding of a protein constituents for another molecule
Question 3. Gel-filtration chromatography separates on the basis of
  1.    size and shape using porous beads packed in a column
  2.    shape using porous beads packed in a column
  3.    None of these
  4.    size using porous beads packed in a column
Explanation:-
Answer: Option A. -> size and shape using porous beads packed in a column
Question 4. In ion-exchange chromatography
  1.    proteins are separated on the basis of their net charge
  2.    either (b) or (c)
  3.    proteins are separated on the basis of their size
  4.    proteins are separated on the basis of their shape
Explanation:-
Answer: Option A. -> proteins are separated on the basis of their net charge
Question 5. Which of the following may be added to stabilize the protein after yeast cells disruption?
  1.    All of these
  2.    Protease inhibitor
  3.    AMP
  4.    NaCl
Explanation:-
Answer: Option A. -> All of these
Question 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?
  1.    100,000 units/mg
  2.    10,000 units/mg.
  3.    1,000 units/mg
  4.    1,000,000 units/mg
Explanation:-
Answer: Option A. -> 100,000 units/mg
Question 7. The best way to determine the location of protein in the purification scheme is to measure the
  1.    mass spectroscopy of the protein
  2.    rate of ATP synthesis
  3.    changes in the refractive index
  4.    UV absorption
Explanation:-
Answer: Option B. -> rate of ATP synthesis
Question 8. Proteins separation can be carried out on the basis of
  1.    size or mass
  2.    all of these
  3.    net charge
  4.    solubility in salt solutions
Explanation:-
Answer: Option B. -> all of these
Question 9.  During successful purification scheme, this may be expected that the
  1.    specific activity increases
  2.    specific activity decreases
  3.    number of proteins in the sample decreases
  4.    both (a) and (c)
Explanation:-
Answer: Option D. -> both (a) and (c)
Question 10.  In ion-exchange chromatography
  1.    proteins are separated on the basis of their net charge
  2.    proteins are separated on the basis of their size
  3.    proteins are separated on the basis of their shape
  4.    either (b) or (c)
Explanation:-
Answer: Option A. -> proteins are separated on the basis of their net charge
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