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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Definitions:

Sensation

The process by which sensory receptors and the nervous system receive and represent stimuli from the environment.

Perception

The process of organizing and interpreting sensory information to make it meaningful.

Absolute Threshold

The minimum stimulus intensity required to detect a stimulus or produce a sensory response in at least 50% of trials, indicating the limits of human sensory perception.

Difference Threshold

The smallest amount of change between two stimuli that a person can detect 50% of the time, also known as the just noticeable difference (JND).