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MCQs

Total Questions : 48 | Page 5 of 5 pages
Question 41. .  An enzyme that is always produced, regardless of the presence of substrates or the end products, is called
  1.    a constitutive enzyme
  2.    an isoenzyme
  3.    a repressible enzyme
  4.    an allosteric enzyme
 Discuss Question
Answer: Option A. -> a constitutive enzyme
Question 42. . 
Hydrogen and oxygen release enormous amounts of energy when they react. Yet, hydrogen and oxygen can be mixed together in a balloon and nothing will happen. Why?
  1.    Competitive inhibitors are blocking the reaction from occurring in the active site
  2.    There must be contaminating elements in the balloon that prohibit the reaction from occurring
  3.    The energy of activation to form the transition-state complex is too high to allow the reaction to occur without assistance
  4.    all of the above
 Discuss Question
Answer: Option A. -> Competitive inhibitors are blocking the reaction from occurring in the active site
Question 43. . The ability of CTP to bind to aspartate carbamoyltransferase and shut down the synthesis of more CTP is an example of
  1.    enzyme induction
  2.    enzyme repression
  3.    feedback inhibition of enzyme activity
  4.    none of these
 Discuss Question
Answer: Option C. -> feedback inhibition of enzyme activity
Question 44. . About 7.3 kcal/mole are released when
  1.    glucose is converted to CO2 and H2O
  2.    NAD+ is reduced to NADH
  3.    ATP hydrolysis is coupled to sucrose synthesis
  4.    the terminal phosphate bond of ATP is broken by hydrolysis
 Discuss Question
Answer: Option A. -> glucose is converted to CO2 and H2O
Question 45. . Oxidation is the
  1.    loss of proton
  2.    gain of electron
  3.    loss of electron
  4.    gain of protons
 Discuss Question
Answer: Option C. -> loss of electron
Question 46. . Denaturation of an enzyme refers to the
  1.    improper arrangement of the enzyme in a metabolic pathway
  2.    loss of the enzymes proper shape
  3.    formation of the enzymes proper shape
  4.    formation of a new isozyme for that enzyme
 Discuss Question
Answer: Option B. -> loss of the enzymes proper shape
Question 47. . Oxidation is the
  1.    loss of proton
  2.    gain of electron
  3.    loss of electron
  4.    gain of protons
 Discuss Question
Answer: Option C. -> loss of electron
Question 48. . Denaturation of an enzyme refers to the
  1.    improper arrangement of the enzyme in a metabolic pathway
  2.    loss of the enzymes proper shape
  3.    formation of the enzymes proper shape
  4.    formation of a new isozyme for that enzyme
 Discuss Question
Answer: Option B. -> loss of the enzymes proper shape

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