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MCQs

Total Questions : 301 | Page 27 of 31 pages
Question 261. In 3° structure of proteins, folding and shaping is done by __________
  1.    Hydrophobic interactions
  2.    Polar interactions
  3.    Hydrogen bonding
  4.    None of the mentioned
 Discuss Question
Answer: Option A. -> Hydrophobic interactions
Answer: (a).Hydrophobic interactions
Question 262. Which of the following is a Sanger’s reagent?
  1.    1-fluoro-2, 4-dinitrobenzene
  2.    1-fluoro-2, 3-dinitrobenzene
  3.    1-fluoro-2, 4-trinitrobenzene
  4.    1-fluoro-2, 3-trinitrobenzene
 Discuss Question
Answer: Option A. -> 1-fluoro-2, 4-dinitrobenzene
Answer: (a).1-fluoro-2, 4-dinitrobenzene
Question 263. Which of the following compound is not involved in Edman degradation?
  1.    Phenylisothiocyanate
  2.    CF₃COOH
  3.    FDNB
  4.    Phenylthiocarbonyl
 Discuss Question
Answer: Option C. -> FDNB
Answer: (c).FDNB
Question 264. The amino acid sequences of thousands of different proteins from many species have been determined using principles first developed by?
  1.    Edman
  2.    Sanger
  3.    Mendel
  4.    Watson and Crick
 Discuss Question
Answer: Option B. -> Sanger
Answer: (b).Sanger
Question 265. Which of the following statements is false?
  1.    Oxidation of cysteine residue with performic acid is done to break disulfide bond in proteins
  2.    Reduction of cysteine residue with dithiothreitol is done to break disulfide bond in proteins
  3.    Reduction of cysteine residue with performic acid is done to break disulfide bond in proteins
  4.    Reduced cysteine is further acetylated by iodoacetate
 Discuss Question
Answer: Option C. -> Reduction of cysteine residue with performic acid is done to break disulfide bond in proteins
Answer: (c).Reduction of cysteine residue with performic acid is done to break disulfide bond in proteins
Question 266. Cleaving of peptide chain is done by _________
  1.    Trypsin
  2.    Tyrosine
  3.    Tryptophan
  4.    Arginine
 Discuss Question
Answer: Option A. -> Trypsin
Answer: (a).Trypsin
Question 267. ATP hydrolysis is coupled in
  1.    primary active transport
  2.    secondary active transport
  3.    tertiary active transport
  4.    none of above
 Discuss Question
Answer: Option A. -> primary active transport
Answer: (a).primary active transport
Question 268. At pH = 1, the amino acid exists as
  1.    anion
  2.    cation
  3.    zwitterion
  4.    Neutral
 Discuss Question
Answer: Option B. -> cation
Answer: (b).cation
Question 269. Polar amino acids are usually found
  1.    on the surface of proteins
  2.    inside the core of proteins
  3.    at the sides of proteins
  4.    can be present anywhere in proteins
 Discuss Question
Answer: Option A. -> on the surface of proteins
Answer: (a).on the surface of proteins
Question 270. At pH equal to pKa the amino acid solution exists as
  1.    cationic form
  2.    anionic form
  3.    zwitterion form
  4.    both a and c
 Discuss Question
Answer: Option D. -> both a and c
Answer: (d).both a and c

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