The Following Table Presents the Effect of Different Media on the Growth

question 13

Essay

The following table presents the effect of different media on the growth response of tryptophan mutations in Salmonella typhimurium (+ = growth,- = no growth).
$\begin{array}{r}\underline {\text { Medium Supplemented with } } \\\begin{array}{cccc} \text { Strain } & \text { No Supplement } &\text { IGP } & \text { AA } & \text { IN } & \text { TRY } \\\hline\operatorname{trp}-8 &-&+ & + & + & + \\\operatorname{trp}-2 &-&+ & - & + & + \\\operatorname{trp}-3 &-&- & - & + & + \\\operatorname{trp}-1&-&- & - & - & +\end{array}\end{array}$ (a) Construct the biochemical pathway for the compounds IGP,AA,IN,and TRY based on these data.
(b) Place strains of bacteria (mutations)in the appropriate steps in the pathway.
(c) In bacteria it is often possible to make partial diploid strains.Assume that a diploid strain was made containing the complete genomes of the trp-2 and trp-1 strains.Would this diploid strain be able to grow on the unsupplemented medium? Explain your answer.

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Definitions:

ERP Signals

Event-Related Potentials; these are measured brain responses that are the direct result of a specific sensory, cognitive, or motor event.

Stimulus Presentation

The method or manner in which a stimulus is shown to a participant in a study, affecting their reactions or responses.

Milliseconds

A unit of time equal to one thousandth of a second, often used to measure the time of quick processes or reactions.

Attention Hypothesis

A theory suggesting that the ability to pay attention to specific stimuli or tasks is a critical factor in cognitive performance and learning.