You grow a culture of bacteria and split it into two culture tubes.One sample of bacteria you treat with calcium and the other is not treated.You then attempt to transform the two samples with a plasmid.Both samples survive,but only the samples treated with calcium take up the plasmid.What is the most likely explanation for your results?
A)The bacteria use calcium as a source of energy to take up the DNA. B)DNA is degraded in the absence of calcium. C)The calcium makes the bacterial membrane more porous to DNA. D)Calcium precipitates DNA,preventing it from being taken up by cells. E)The bacteria require calcium to grow.