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Assertion A is true: Recombinant DNA technology allows insertion of desired genes into vectors (e.g., plasmids) that can be introduced into bacteria (such as E. coli) for amplification (cloning) and expression of the gene product. Reason R is false: Not any bacterium can carry an expression vector. Specific bacterial strains (e.g., competent E. coli) with appropriate genetic modifications are used, and vectors have specific host ranges (e.g., Gram-negative vectors do not work in Gram-positive bacteria). The statement is an overgeneralization.