Discussion
The main difference between a self-transmissible and a mobilizable plasmid is that the self-transmissible plasmid
Answer: B
Correct answer: carries genes encoding the mating apparatus
A self-transmissible, or conjugative, plasmid carries the complete tra region - the genes for the sex pilus and the rest of the mating apparatus, together with the transfer origin - so it can organise its own conjugation from start to finish.
A mobilizable plasmid carries the transfer origin but not the mating genes, so it can only move when a conjugative plasmid in the same cell supplies the apparatus. Both types transfer a single strand of DNA, and both may or may not carry resistance genes or transposons, so those options do not distinguish them.
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