During infection of $\mathrm{E}$. coli cells by bacteriophage $T2$,

  • A

    proteins are the only phage components that actually enter the infected cell.

  • B

    both proteins and nucleic acids enter the cell.

  • C

    only proteins from the infecting phage can also be detected in progeny phage.

  • D

    only nucleic acids enter the cell.

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