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MCQs

Total Questions : 193 | Page 16 of 20 pages
Question 151. The cleavage specificity of trypsin and chymotrypsin depend in part on the
  1.    proximity of Ser 195 to the active site or specificity pocket
  2.    size, shape, and charge of the active site or specificity pocket
  3.    presence of a low-barrier hydrogen bond in the active site or specificity pocket
  4.    absence of water in the active site
 Discuss Question
Answer: Option B. -> size, shape, and charge of the active site or specificity pocket
Answer: (b).size, shape, and charge of the active site or specificity pocket
Question 152. Which of the common features are shared between serine and aspartate proteases?
  1.    Both require water to complete the catalytic cycle
  2.    Both use a base to activate the nucleophile
  3.    Both show specificity for certain amino acid sequences
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Answer: (d).All of the above
Question 153. The E.coli pyruvic acid dehydrogenase complex is reported to
  1.    decatalyze the oxidation of pyruvic acid to acetyl Co A and CO₂
  2.    Catalyze the oxidation of pyruvic acid to acetyl Co A and CO₂
  3.    retard the reduction of pyruvic acid to acetyl Co A and CO₂
  4.    Catalyze the reduction of pyruvic acid to acetyl Co A and CO₂
 Discuss Question
Answer: Option B. -> Catalyze the oxidation of pyruvic acid to acetyl Co A and CO₂
Answer: (b).Catalyze the oxidation of pyruvic acid to acetyl Co A and CO₂
Question 154. Common feature in all serine proteases is a
  1.    hydrophobic specificity pocket
  2.    hydrophilic specificity pocket
  3.    cluster of reactive serine residues
  4.    single reactive serine residue
 Discuss Question
Answer: Option D. -> single reactive serine residue
Answer: (d).single reactive serine residue
Question 155. Before they can react, many molecules need to be destabilized. This state is typically achieved through
  1.    changing the three-dimensional shape of the molecule
  2.    oxidizing the molecules by removing electrons
  3.    changing the reaction from a biosynthetic to a catabolic pathway
  4.    the input of a small amount of activation energy
 Discuss Question
Answer: Option D. -> the input of a small amount of activation energy
Answer: (d).the input of a small amount of activation energy
Question 156. Citric acid accumulation would
  1.    stimulate phosphofructokinase activity
  2.    stimulate fructose 1,6 diphosphatase activity
  3.    inhibit phosphofructokinase activity
  4.    both (b) and (c)
 Discuss Question
Answer: Option D. -> both (b) and (c)
Answer: (d).both (b) and (c)
Question 157. The ultimate source of energy that sustains living systems is
  1.    glucose
  2.    oxygen
  3.    sunlight
  4.    carbon dioxide
 Discuss Question
Answer: Option C. -> sunlight
Answer: (c).sunlight
Question 158. Which of the following would be considered a part of metabolism?
  1.    Biosynthetic pathways that build DNA
  2.    Catabolic pathways that break down complex carbohydrates
  3.    The capture of light energy for use in making glucose
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Answer: (d).All of the above
Question 159. Insulin
  1.    stimulates gluconeogenesis and glycolysis
  2.    stimulates gluconeogenesis and inhibits glycolysis
  3.    inhibits gluconeogenesis and glycolysis
  4.    inhibits gluconeogenesis and stimulates glycolysis
 Discuss Question
Answer: Option D. -> inhibits gluconeogenesis and stimulates glycolysis
Answer: (d).inhibits gluconeogenesis and stimulates glycolysis
Question 160. Which of the following is not involved in the biosynthesis of DNA?
  1.    Energy from ATP
  2.    Mononucleotides
  3.    Carbonic anhydrase
  4.    Enzymes
 Discuss Question
Answer: Option C. -> Carbonic anhydrase
Answer: (c).Carbonic anhydrase

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