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MCQs

Total Questions : 48 | Page 4 of 5 pages
Question 31.  If the free energy change (ΔG) in a reaction is a negative value, it indicates that the
  1.    reaction releases energy
  2.    reaction absorbs energy
  3.    reaction is in negative direction
  4.    reaction is in positive direction
 Discuss Question
Answer: Option A. -> reaction releases energy
Question 32. . In the reaction, C6H12O6 + 6O2 → 6CO2 + 6H2O + energy, which component is being reduced?
  1.    O2
  2.    CO2
  3.    H2O
  4.    Energy
 Discuss Question
Answer: Option A. -> O2
Question 33.  To a living organism, which of the following has the greatest amount of available energy per molecule?
  1.    ATP
  2.    ADP
  3.    AMP
  4.    H2O
 Discuss Question
Answer: Option A. -> ATP
Question 34. . Which of the following is the best evidence for the lock and key theory of enzyme action?
  1.    Compounds similar in structure to the substrate inhibit enzyme activity
  2.    Enzymes are found in living organisms and speed up certain reactions
  3.    Enzymes speed up reactions by definite amounts
  4.    Enzymes determine the direction of a reaction
 Discuss Question
Answer: Option A. -> Compounds similar in structure to the substrate inhibit enzyme activity
Question 35. . The affinity of an enzyme for its substrate, when the enzyme has a Km of 0.50 M will be __________ than the affinity of an enzyme for its substrate when the enzyme has a Km of 0.05 M.
  1.    greater
  2.    lesser
  3.    approximately equal
  4.    half
 Discuss Question
Answer: Option B. -> lesser
Question 36. . In the reaction, C6H12O6+ 6O2 → 6CO2 + 6H2O + energy, which component is being oxidized?
  1.    C6H12O6
  2.    O2
  3.    CO2
  4.    H2O
 Discuss Question
Answer: Option A. -> C6H12O6
Question 37. . The fact that β-oxidation of fatty acids, occurs in the mitochondria whereas fatty acid synthesis occurs in the cytoplasmic matrix, is an example of regulation of enzymatic activity by the __________ mechanism.
  1.    compartmentation
  2.    induction
  3.    competitive inhibition
  4.    repression
 Discuss Question
Answer: Option D. -> repression
Question 38. . Anthranilate synthase, the first enzyme of tryptophan biosynthesis after the branch point shows feedback inhibition and repression due to
  1.    L-tryptophan
  2.    D-L-tryptophan hydantoin
  3.    L-serine
  4.    pyruvate
 Discuss Question
Answer: Option A. -> L-tryptophan
Question 39. . Adenosine triphosphate is a type of
  1.    fatty acid
  2.    amino acid
  3.    nucleotide
  4.    steroid
 Discuss Question
Answer: Option C. -> nucleotide
Question 40. . A substrate binds to its enzyme at a location called the __________ site.
  1.    coenzyme
  2.    substrate
  3.    active
  4.    polypeptide
 Discuss Question
Answer: Option C. -> active

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