The genome consists of alinear duplex DNA molecule about 17 µm in length. It consists of about %.500 base pairs, and has a molecular weight of about 31x:105 daltons.
The ends of the duplex have single stranded regions which are complementary to each other. When stored for some time the linear DNA molecules become circular.
Random collisions cause the single stranded ends to touch, producing the circular molecules.
When linear lambda DNA is injected into the host cell, it is converted into the circular form, and then covalently joined by a cellular ligase.
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