E-PolyLearning

31. Which of the following is not an essential amino acid?
a. Aspartic acid
b. Glutamic acid
c. Glycine
d. All of these
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Answer: (d).All of these

32. Which of the following is not a sensible grouping of amino acids based on their polarity properties?
a. Ala, Leu, and Val
b. Arg, His, and Lys
c. Phe, Trp, and Tyr
d. Asp, Ile, and Pro
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Answer: (d).Asp, Ile, and Pro

33. Proteins and macromolecular structures take on their higher order structures
a. by self-assembly
b. with the help of molecular chaperons
c. with the help of precursor sequences that are removed from the final structures
d. all of the above
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Answer: (d).all of the above

34. 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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Answer: (d).both (a) and (c)

35. 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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Answer: (a).proteins are separated on the basis of their net charge