11.1Introduction Episome is a plasmid able to integrate into bacterial dNA epistasis Immunity in phages refers to the ability of a prophage to prevent another hage of the same type from infecting a cell. It results from the synthesis of phage repressor by the prophage genome Induction refers to the ability of bacteria(or yeast) to synthesize certain enzymes only when their substrates are present; applied to gene expression refers to switching on transcription as a result of interaction of the inducer with the regulator protein Lysogeny describes the ability of a phage to survive in a bacterium as a stable prophage component of the bacterial genome Lytic infection of bacteria by a phage ends in destruction of bacteria and release of progeny phage Plasmid is an autonomous self-replicating extrachromosomal circular DNA Prophage is a phage genome covalently integrated as a linear part of the bacterial chromosome 请莘大Episome is a plasmid able to integrate into bacterial DNA. Epistasis Immunity in phages refers to the ability of a prophage to prevent another phage of the same type from infecting a cell. It results from the synthesis of phage repressor by the prophage genome. Induction refers to the ability of bacteria (or yeast) to synthesize certain enzymes only when their substrates are present; applied to gene expression, refers to switching on transcription as a result of interaction of the inducer with the regulator protein. Lysogeny describes the ability of a phage to survive in a bacterium as a stable prophage component of the bacterial genome. Lytic infection of bacteria by a phage ends in destruction of bacteria and release of progeny phage. Plasmid is an autonomous self-replicating extrachromosomal circular DNA. Prophage is a phage genome covalently integrated as a linear part of the bacterial chromosome. 11.1 Introduction