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MCQs

Total Questions : 127 | Page 12 of 13 pages
Question 111. . Which of the following enzymes plays an important role in the Cori " cycle?
  1.    Glucokinase
  2.    Glucose-6-phosphate dehydrogenase
  3.    Lactate dehydrogenase
  4.    Glucose isomerase
 Discuss Question
Answer: Option C. -> Lactate dehydrogenase
Question 112. . Regulated metabolic pathways are
  1.    compartmentalized in eukaryotes
  2.    usually regulated at the first step
  3.    committed after the first step
  4.    all of these
 Discuss Question
Answer: Option D. -> all of these
Question 113. . 
When living organisms are cooled below some critical body temperature, the metabolic reactions within their cells cease to function properly. This malfunction occurs because
  1.    their enzymes lose the proper three-dimensional shape
  2.    enzyme active sites become permanently bound to substrates
  3.    the activation energy for the reaction is raised
  4.    there is insufficient molecular motion for substrates to interact
 Discuss Question
Answer: Option D. -> there is insufficient molecular motion for substrates to interact
Question 114. . Glycogen degradation requires the enzyme namely
  1.    glycogen phosphorylase and phosphoglucomutase
  2.    glycogen phosphorylase and glycogen-debranching enzyme
  3.    glycogen synthase and phosphorylase
  4.    none of the above
 Discuss Question
Answer: Option B. -> glycogen phosphorylase and glycogen-debranching enzyme
Question 115. . What is the cause of the genetic disease known as Galactosemia?
  1.    Deficiency in lactase
  2.    Absence of galactose 1-P uridyl transferase
  3.    Absence of lactose synthetase
  4.    Non functioning of semnase
 Discuss Question
Answer: Option B. -> Absence of galactose 1-P uridyl transferase
Question 116. . The hormones, glucagon and epinephrine, stimulate glycogen breakdown to G-6-P
  1.    only in the liver
  2.    using ATP as the phosphoryl donor
  3.    directly, by binding to glycogen phosphorylase
  4.    indirectly, by first stimulating adenylate cyclase to make cAMP
 Discuss Question
Answer: Option D. -> indirectly, by first stimulating adenylate cyclase to make cAMP
Question 117. . Which of the following does not occur during gluconeogenesis?
  1.    The carboxylation of pyruvate to oxaloacetate
  2.    The conversion of pyruvate to phosphoenolpyruvate (PEP)
  3.    The decarboxylation of oxaloacetate to phosphoenolpyruvate
  4.    The conversion of PEP to fructose bisphosphate
 Discuss Question
Answer: Option B. -> The conversion of pyruvate to phosphoenolpyruvate (PEP)
Question 118. . Which of the following characteristic enzymes of gluconeogensis is not found in the cytosol?
  1.    Pyruvate carboxlyase
  2.    Fructose-l,6-bisphosphatase
  3.    Both (a) and (b)
  4.    Glucose-6-phosphatase
 Discuss Question
Answer: Option A. -> Pyruvate carboxlyase
Question 119. . The function of gluconeogenesis is
  1.    maintenance of blood glucose levels during starvation or a low carbohydrate diet
  2.    recovery of lactate from fermentation and glycerol from fat breakdown
  3.    a pathway for the utilization of amino acids
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above
Question 120. . What is the consensus N-glycosylation site in a protein sequence?
  1.    Asn-Xaa-(Ser or Thr)
  2.    (Ser or Thr)-Asn-Ala
  3.    Thr-(Asn or Gln)-Ala
  4.    None of these
 Discuss Question
Answer: Option A. -> Asn-Xaa-(Ser or Thr)

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