Question

32. Streptococcus pneumoniae cells of genotype sur mtl - are transformed by donor DNA of genotype stri mtl+ and (in a separate experiment) by a mixture of two DNAs with genotypes strk mtl- and strs mtlt. The accompanying table shows the results.

Answer 1

First row shows transformation between strs mtl- and strr mtl+. This is transformation between one bacterium and one type of DNA.

Second row shows transformation between strs mtl- and strs mtl- + strs mtl+. The former is the bacterium and the latter is DNA mixture.

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