Discussion
The common feature of the following bacteriophages φ × 174, OB, N4 and P1 is :
Answer: D
The common feature is that all infect E. coli.
All four are coliphages, but their genomes differ. φX174 has a circular single-stranded DNA genome; Qβ (printed OB) has a single-stranded RNA genome; N4 has a linear double-stranded DNA genome; and P1 has a double-stranded DNA genome that is packaged as a linear molecule and circularises in the host, where it can persist as a plasmid-like prophage.
So single-stranded DNA fits only φX174, an RNA genome only Qβ, and a circular genome is not shared by the linear N4 genome. The host is the one thing they have in common.
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