Overview: The study of a single well-chosen substance, here aspartate transcarb amylase, can provide an excellent basis for a laboratory course. The student is introduced to a variety of scientific ideas and to many experi mental and interpretive techniques. This enzyme is readily available, is relatively stable, has an extensive literature, and its behavior has many facets: substrate inhibition, a large change in structure upon homo tropic activation by substrates, allosteric stimulation by ATP, allosteric inhibition by CTP synergistic with VTP, positive cooperativity for sub strates, neg
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