M.Sc. Bio-Physics (PU-CET P.G) 2022 Panjab University Entrance Exam With Answers

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73.

Besides a high voltage shock, what is another method to make E. coli competent to take up “naked” DNA?

A: High concentrations of calcium ions followed by high temperature
B: High concentrations of calcium ions and several hours on ice
C: Large amounts of DNA added directly to a bacterial culture growing at 37 °C
D: High concentrations of minerals followed by high temperature

The answer is: A