Test: GRE Subject Test: Biology

Bacterial transformations are a useful tool for biologists to replicate valuable plasmid DNA so that it can be used for a myriad of experiments. A student researcher has designed an experiment to determine the effects of pre-incubation duration, heat shock duration, and heat shock temperature on transformation efficiency. The student transformed 1μg of a β-lactamase encoding plasmid and recovered the bacteria for 1 hour at 37°C (shaking at 225rpm) for all conditions in Table 1. He then plated the transformed bacteria on ampicillin agar places and observed growth 24 hours later. Table 1 outlines the variables in the experiment. 

 

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1.

Besides the indicated variables in table 1, what is most likely the next variable the student would introduce in this experiment to optimize transformation efficiency?

Varying amounts of plasmid DNA 

None of the other answers

Varying concentrations of ampicillin

Chemical competent bacteria verses electro-competent bacteria

Water incubators verses air-vented incubators

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