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Total Questions : 127 | Page 6 of 13 pages
Question 51. The hormones, glucagon and epinephrine, stimulate glycogen breakdown to G-6-P
  1.    using ATP as the phosphoryl donor
  2.    indirectly, by first stimulating adenylate cyclase to make cAMP
  3.    only in the liver
  4.    directly, by binding to glycogen phosphorylase
 Discuss Question
Answer: Option B. -> indirectly, by first stimulating adenylate cyclase to make cAMP
Question 52. Regulated metabolic pathways are
  1.    all of these
  2.    compartmentalized in eukaryotes
  3.    committed after the first step
  4.    usually regulated at the first step
 Discuss Question
Answer: Option A. -> all of these
Question 53. What is the cause of the genetic disease known as Galactosemia?
  1.    Absence of galactose 1-P uridyl transferase
  2.    Absence of lactose synthetase
  3.    Deficiency in lactase
  4.    Non functioning of semnase
 Discuss Question
Answer: Option A. -> Absence of galactose 1-P uridyl transferase
Question 54. 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.    there is insufficient molecular motion for substrates to interact
  2.    enzyme active sites become permanently bound to substrates
  3.    the activation energy for the reaction is raised
  4.    their enzymes lose the proper three-dimensional shape
 Discuss Question
Answer: Option A. -> there is insufficient molecular motion for substrates to interact
Question 55. Glycogen degradation requires the enzyme namely
  1.    glycogen phosphorylase and phosphoglucomutase
  2.    glycogen phosphorylase and glycogen-debranching enzyme
  3.    None of these
  4.    glycogen synthase and phosphorylase
 Discuss Question
Answer: Option B. -> glycogen phosphorylase and glycogen-debranching enzyme
Question 56. Which of the following characteristic enzymes of gluconeogensis is not found in the cytosol?
  1.    Both (a) and (b)
  2.    Glucose-6-phosphatase
  3.    Pyruvate carboxlyase
  4.    Fructose-l,6-bisphosphatase
 Discuss Question
Answer: Option C. -> Pyruvate carboxlyase
Question 57. Which of the following does not occur during gluconeogenesis?
  1.    The conversion of pyruvate to phosphoenolpyruvate (PEP)
  2.    The carboxylation of pyruvate to oxaloacetate
  3.    The conversion of PEP to fructose bisphosphate
  4.    The decarboxylation of oxaloacetate to phosphoenolpyruvate
 Discuss Question
Answer: Option A. -> The conversion of pyruvate to phosphoenolpyruvate (PEP)
Question 58. What is the consensus N-glycosylation site in a protein sequence?
  1.    Thr-(Asn or Gln)-Ala
  2.    (Ser or Thr)-Asn-Ala
  3.    Asn-Xaa-(Ser or Thr)
  4.    None of these
 Discuss Question
Answer: Option C. -> Asn-Xaa-(Ser or Thr)
Question 59. The process not involved in the formation of glucose by gluconeo-genesis is
  1.    All of these
  2.    the conversion of oxaloacetate to glucose
  3.    the dephosphorylation of glucose-6-phosphate
  4.    the conversion of lactate to pyruvate
 Discuss Question
Answer: Option B. -> the conversion of oxaloacetate to glucose
Question 60. The function of gluconeogenesis is
  1.    recovery of lactate from fermentation and glycerol from fat breakdown
  2.    All of these
  3.    maintenance of blood glucose levels during starvation or a low carbohydrate diet
  4.    a pathway for the utilization of amino acids
 Discuss Question
Answer: Option B. -> All of these

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