Escherichia coli cells are made competent to observe external DNA by
A. giving the high-temperature
B. suspending them in cold calcium chloride
C. treating the cells with sodium chloride
D. growing them in culture
Answer:B
Escherichia coli cells are made competent to observe external DNA by
A. giving the high-temperature B. suspending them in cold calcium chloride C. treating the cells with sodium chloride D. growing them in culture