Microbial Recombination and Gene Transfer
The expression of gene X (which has promoter Px) is to be monitored. A gene fusion construction for carrying this work will

give the same information as from a microarray
have the promoter of lacZ or some other reporter gene
have Px but not the rest of the X coding region
allow to monitor the expression of all genes with a promoter similar in sequence to Px

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Microbial Recombination and Gene Transfer
In lysogeny,

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

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