Annotation of Sequences of Transposon Insertion Sites in the Chromosome

question 61

Multiple Choice

Annotation of sequences of transposon insertion sites in the chromosome of Escherichia coli O157:H7 cells that had lost their acid-resistance properties revealed four genes: two encoding isoforms of glutamate decarboxylase (GadA and GadB) and one encoding a glutamate/gamma-aminobutyric acid (GABA) antiporter. What does the fourth gene encode?

• A) a heat shock protein
• B) a possible regulator
• C) a glutamate/GABA symporter
• D) a GABA uniporter
• E) a glutamate carrier protein

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