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MCQs

Total Questions : 48 | Page 1 of 5 pages
Question 1. The ability of Vibrio fischeri to convert chemical energy directly into radiant energy in bioluminescence is an example of __________ at work.
  1.    Shelford's law of tolerance
  2.    the third law of thermodynamics
  3.    the first law of thermodynamics
  4.    Leibig's law of the minimum
 Discuss Question
Answer: Option C. -> the first law of thermodynamics
Question 2. The ability of FADH to be oxidized is __________ than the ability of FAD to be oxidized.
  1.    greater
  2.    approximately equal
  3.    half
  4.    lesser
 Discuss Question
Answer: Option A. -> greater
Question 3. Reduction is the
  1.    gain of protons
  2.    gain of electron
  3.    loss of proton
  4.    loss of electron
 Discuss Question
Answer: Option B. -> gain of electron
Question 4. The ability of a competitive inhibitor to bind to an active site in an allosterically controlled enzyme is __________ than the ability of a non-competitive inhibitor to bind to an active site in the same allosterically controlled enzyme.
  1.    approximately equal
  2.    greater
  3.    lesser
  4.    half
 Discuss Question
Answer: Option B. -> greater
Question 5. An endergonic reaction is one that
  1.    requires energy in order to proceed
  2.    gives off much heat
  3.    looses energy
  4.    releases energy for work
 Discuss Question
Answer: Option A. -> requires energy in order to proceed
Question 6. If the free energy change (ΔG) in a reaction is a negative value, it indicates that the
  1.    reaction absorbs energy
  2.    reaction releases energy
  3.    reaction is in negative direction
  4.    reaction is in positive direction
 Discuss Question
Answer: Option B. -> reaction releases energy
Question 7. To a living organism, which of the following has the greatest amount of available energy per molecule?
  1.    ADP
  2.    AMP
  3.    H2O
  4.    ATP
 Discuss Question
Answer: Option D. -> ATP
Question 8. An exergonic reaction is one that
  1.    releases energy for work
  2.    gives off much heat
  3.    requires energy to proceed
  4.    looses energy
 Discuss Question
Answer: Option A. -> releases energy for work
Question 9. If the Keq for an enzymatic reaction is greater than 1, the reaction
  1.    both (a) and (b)
  2.    can not occur without the input of energy
  3.    will be endergonic
  4.    none of these
 Discuss Question
Answer: Option D. -> none of these
Question 10. Which of the following is the best evidence for the lock and key theory of enzyme action?
  1.    Enzymes determine the direction of a reaction
  2.    Compounds similar in structure to the substrate inhibit enzyme activity
  3.    Enzymes speed up reactions by definite amounts
  4.    Enzymes are found in living organisms and speed up certain reactions
 Discuss Question
Answer: Option B. -> Compounds similar in structure to the substrate inhibit enzyme activity

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