Scientists can use mutants to study metabolic pathways. these organisms have a mutation in a gene encoding a metabolic pathway enzyme that results in the activation of that enzyme. saccharomyces cerevisiae (a yeast species) mutants are available that grow on pyruvate or ethanol, but not sugars or glycerol. which of the following glycolytic enzymes is most likely affected?
1. triose phosphate isomerase
2. aldolase -phophoglucose isomerase (phosphohexose isomerase or glucose-6-phosphate isomerase)
3. hexokinase
4. pyruvate kinase
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