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episome

(Encyclopedia) episome ĕp´ĭsōm [key], unit of genetic material composed of a series of genes that sometimes has an independent existence in a host cell and at other times is integrated into a ...

bacteriophage

(Encyclopedia) bacteriophage băktēr´ēəfāj˝ [key], virus that infects bacteria and sometimes destroys them by lysis, or dissolution of the cell. Bacteriophages, or phages, have a head composed o...

recombination

(Encyclopedia) recombination, process of shuffling of genes by which new combinations can be generated. In recombination through sexual reproduction , the offspring's complete set of genes...

Jacob, François

(Encyclopedia) Jacob, François fräNswä´ zhäkôb´ [key], 1920–2013, French biologist and geneticist, educated at the Sorbonne. His medical studies were interrupted by World War II. He joined the Free ...

virus

(Encyclopedia) virus, parasite with a noncellular structure composed mainly of nucleic acid within a protein coat. Most viruses are too small (100–2,000 Angstrom units) to be seen with the light micr...

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