chromosome « Back to Glossary IndexA part of the genome (DNA) of an organism that contains essential functions. Related Articles: 13 – 3 The viral life cycle, early events13 – 5 Lambda phage is a lysogenic virus with double-stranded DNA13 – 7 P22 is a lysogenic, double-stranded DNA phage that was important in the development of bacterial genetics13 – 8 P1 is a double-stranded DNA phage with an ability to infect different hosts13 – 10 M13 has a genome composed of a single-stranded, circular DNA molecule« Back to Glossary Index