Microbial Recombination and Gene Transfer
In the extracellular medium, DNA-degrading enzymes would likely be to prevent transfer of DNA by

None of these
generalized phage transduction
natural transformation
conjugal transfer by a self-transmissible plasmid

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Microbial Recombination and Gene Transfer
In lysogeny,

a bacteriophage transfers bacterial DNA
a bacteriophage genome is integrated into the bacterial genome
bacteria take up double stranded DNA from the environment
DNA-degrading enzymes in the extracellular medium would stop the process

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