The types of reactions catalyzed by a) hydrolases b) Lyases and c) Transferases are to be given. Concept introduction: The enzyme hydrolases catalyze hydrolysis of esters, amides and related substrates. The enzyme lyases catalyze the elimination or addition of small molecules such as water from or to a substrate. The enzyme transferases catalyze the transfer of a group from one substrate to another. To give: The types of reactions catalyzed by a) hydrolases b) Lyases and c) Transferases.

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20. The Brusselator. This hypothetical system was first proposed by a group work- ing in Brussels [see Prigogine and Lefever (1968)] in connection with spatially nonuniform chemical patterns. Because certain steps involve trimolecular reac tions, it is not a model of any real chemical system but rather a prototype that has been studied extensively. The reaction steps are A-X. B+X-Y+D. 2X+ Y-3X, X-E. 305 It is assumed that concentrations of A, B, D, and E are kept artificially con stant so that only X and Y vary with time. (a) Show that if all rate constants are chosen appropriately, the equations de scribing a Brusselator are: dt A-(B+ 1)x + x²y, dy =Bx-x²y. di

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Chapter 26.SE, Problem 47AP

Interpretation Introduction

Interpretation:

The types of reactions catalyzed by a) hydrolases b) Lyases and c) Transferases are to be given.

Concept introduction:

The enzyme hydrolases catalyze hydrolysis of esters, amides and related substrates. The enzyme lyases catalyze the elimination or addition of small molecules such as water from or to a substrate. The enzyme transferases catalyze the transfer of a group from one substrate to another.

To give:

The types of reactions catalyzed by a) hydrolases b) Lyases and c) Transferases.

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20. The Brusselator. This hypothetical system was first proposed by a group work- ing in Brussels [see Prigogine and Lefever (1968)] in connection with spatially nonuniform chemical patterns. Because certain steps involve trimolecular reac tions, it is not a model of any real chemical system but rather a prototype that has been studied extensively. The reaction steps are A-X. B+X-Y+D. 2X+ Y-3X, X-E. 305 It is assumed that concentrations of A, B, D, and E are kept artificially con stant so that only X and Y vary with time. (a) Show that if all rate constants are chosen appropriately, the equations de scribing a Brusselator are: dt A-(B+ 1)x + x²y, dy =Bx-x²y. di

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