CHAP QUIZZES

CHAP QUIZZES - CHAPTER 5: BASIC CONCEPTS OF ENZYME ACTION...

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CHAPTER 5: BASIC CONCEPTS OF ENZYME ACTION 1)  A reaction has an equilibrium constant,  K eq , of 50. When performed in the  presence of an appropriate enzyme, the forward rate constant is increased 20- fold. What will happen to the reverse rate constant? B.  It will increase 20-fold. 2)  For a reaction A + B   C + D, the free energy is described as Δ G  = Δ G ° +  RT ln[C][D]/[[A][B] (Equation 1). When is it proper to write equation (1) as Δ G  = Δ G ° +  RT ln K eq  (Equation 2)? B.  When Δ G  = 0 3)  Which of the following statements is true regarding the role an enzyme plays  in catalysis? B.  An enzyme decreases the activation energy. 4)  The alteration of enzyme structure on binding of a substrate to an active site is  referred to as C.  induced fit. 5)  According to convention, the standard state free energy change, Δ G ° , implies   what special conditions in biochemical systems? C.  pH = 7 6)  If  K eq  = 10 -1  for a reaction studied at  T  = 25°C, then Δ G  for this reaction
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C.  could be either exergonic or endergonic; we need more information about the  actual concentrations used. 7)  Which statement is true regarding the active site of an enzyme? C.  The active site is a 3-dimensional cleft within the enzyme, where the substrate  binds due to precisely defined geometries. 8)  Which of the following terms describes an enzyme lacking an essential small  molecule needed for catalytic activity? B.  Apoenzyme. 9)  Which of the following chemical species is NOT known to serve as an  essential group for certain enzymes? C.  Na+ 10)  Which of the following statements is NOT true about transition state analogs? B.  Transition state analogs bind weakly to the enzyme and are very slowly  converted to product.
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CHAPTER 6: KINETICS AND REGULATION 1)  The commonly used derivation of the Michaelis-Menten uses the "steady state  assumption". Which of the following does NOT describe this assumption? B.  The concentrations of enzyme and substrate do not change significantly  during the course of the reaction 2)   V max , the maximum velocity, of an enzyme catalyzed reaction is A.  the rate observed when all enzyme active sites are saturated with substrate 3)  The  K M  for a substrate is equal to the  K d  (dissociation constant) for the  enzyme-substrate complex only when B.   k -1  >  k 2 4)  To obtain  k 2 , the turnover number of an enzyme, one must C.  divide  V max  by the total enzyme concentration
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5)  Enzymes that use two substrates function are considered to function by either  Sequential Displacement or Double Displacement reactions. Which of the 
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This note was uploaded on 04/29/2010 for the course BIOL 1404 taught by Professor Machaeldini during the Fall '09 term at Texas Tech.

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CHAP QUIZZES - CHAPTER 5: BASIC CONCEPTS OF ENZYME ACTION...

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