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MCQs

Total Questions : 173 | Page 17 of 18 pages
Question 161. . Serine and threonine are polar amino acids due to
  1.    reactive hydroxyl group in the side chain
  2.    reactive alcoholic group in the side chain
  3.    reactive keto group in the side chain
  4.    reactive aldehyde group in the side chain
 Discuss Question
Answer: Option A. -> reactive hydroxyl group in the side chain
Question 162. . The sulphur containing side chain of cysteine is
  1.    ampiphillic, highly reactive and capable of reacting with another cysteine
  2.    hydrophillc, highly reactive and capable of reacting with another cysteine
  3.    hydrophobic, highly reactive and capable of reacting with another cysteine
  4.    none of the above
 Discuss Question
Answer: Option C. -> hydrophobic, highly reactive and capable of reacting with another cysteine
Question 163. . Which of the following is a nonprotein amino acid?
  1.    Dopamine
  2.    Hydroxylysine
  3.    Cystine
  4.    None of these
 Discuss Question
Answer: Option A. -> Dopamine
Question 164. . Which of the following is not the hydrophobic and aromatic amino acid?
  1.    Phenylalanine
  2.    Tyrosine
  3.    Tryptophan
  4.    None of these
 Discuss Question
Answer: Option D. -> None of these
Question 165. . Coomassie Blue stains the proteins by reacting with
  1.    arginine residues
  2.    free c-termini
  3.    peptide bonds
  4.    aromatic ring
 Discuss Question
Answer: Option A. -> arginine residues
Question 166. . Which amino acid when exposed to ninhydrin produces a brown color?
  1.    Asparagine
  2.    Proline
  3.    Alanine
  4.    Valine
 Discuss Question
Answer: Option A. -> Asparagine
Question 167. . The α-amino acids have a carboxyl group with a pK around __________ , and an amino group with a pK near __________ .
  1.    1.1, and 12.1
  2.    6.5, and 8.0
  3.    3.3, and 10.5
  4.    2.2, and 9.4
 Discuss Question
Answer: Option D. -> 2.2, and 9.4
Question 168. . Stereo chemical configuration of all a-amino acids derived from proteins is
  1.    L
  2.    D
  3.    L and D
  4.    None of these
 Discuss Question
Answer: Option A. -> L
Question 169. . Which of the following is not the hydrophobic and aromatic amino acid?
  1.    Phenylalanine
  2.    Tyrosine
  3.    Tryptophan
  4.    None of these
 Discuss Question
Answer: Option D. -> None of these
Question 170. . Stereo chemical configuration of all a-amino acids derived from proteins is
  1.    L
  2.    D
  3.    L and D
  4.    None of these
 Discuss Question
Answer: Option A. -> L

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