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MCQs

Total Questions : 60 | Page 3 of 6 pages
Question 21. If the rate of denaturation of enzyme Y is 1.5*10⁻⁴/min, then the half-life of enzyme Y is ______ mins.
  1.    0.462*10³
  2.    4.62*10³
  3.    46.2*10³
  4.    0.0462*10³
 Discuss Question
Answer: Option B. -> 4.62*10³
Answer: (b).4.62*10³
Question 22. What is the rate of denaturation kd, if the half-life of an enzyme catalyzed reaction is 15.6 mins?
  1.    4.4*10⁻²/sec
  2.    0.4*10²/min
  3.    4.4*10⁻²/min
  4.    0.4*10²/sec
 Discuss Question
Answer: Option C. -> 4.4*10⁻²/min
Answer: (c).4.4*10⁻²/min
Question 23. If Kₐ for acetic acid is 1.78*10⁻⁵, the pKₐ of acetic acid is _________
  1.    0.475
  2.    4.75
  3.    2.5
  4.    0.25
 Discuss Question
Answer: Option B. -> 4.75
Answer: (b).4.75
Question 24. The pH at which half the groups of a compound are ionized is referred to as _________
  1.    pKₐ
  2.    pI
  3.    I
  4.    Kₘ
 Discuss Question
Answer: Option A. -> pKₐ
Answer: (a).pKₐ
Question 25. Substances which reduce the rate of enzyme catalyzed reactions are known as ____________
  1.    substrates
  2.    enzymes
  3.    products
  4.    inhibitors
 Discuss Question
Answer: Option D. -> inhibitors
Answer: (d).inhibitors
Question 26. The following rate equation represents _____________ inhibition.
\(V=\frac{V_{max} [S]}{K_m (1+\frac{I}{K_i})+[S]}\)
  1.    competitive
  2.    mixed
  3.    non-competitive
  4.    uncompetitive
 Discuss Question
Answer: Option A. -> competitive
Answer: (a).competitive
Question 27. Uncompetitive inhibition is most noticeable at low substrate concentration and can be overcome at high substrate concentration.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: (b).False
Question 28. The __________ inhibition gives the following rate equation.
\(V=\frac{V_{max} [S]}{K_m+[S](1+\frac{[S]}{K_s})}\)
  1.    Substrate
  2.    Mixed
  3.    Non-competitive
  4.    Competitive
 Discuss Question
Answer: Option A. -> Substrate
Answer: (a).Substrate
Question 29. Inhibition of invertase by sucrose falls into which category of inhibition?
  1.    Substrate inhibition
  2.    Non-competitive inhibition
  3.    Product inhibition
  4.    Competitive inhibition
 Discuss Question
Answer: Option A. -> Substrate inhibition
Answer: (a).Substrate inhibition
Question 30. ______________ inhibition represent the following rate equation.
\(V=\frac{\left (\frac{V_{max}}{1+\frac{[I]}{K_i}}\right )[S]}{K_m+[S]}\)
  1.    Substrate inhibition
  2.    Competitive inhibition
  3.    Product inhibition
  4.    Non-competitive inhibition
 Discuss Question
Answer: Option D. -> Non-competitive inhibition
Answer: (d).Non-competitive inhibition

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