Final answer:
During the biosynthesis stage of a phage infection, the host cell's translation machinery is responsible for the translation of CII and CIII, which are viral proteins. These proteins play a crucial role in the production of new viruses and the lysis of the host cell.
Step-by-step explanation:
In the lytic cycle of a phage infection, the phage replicates and lyses the host cell. During the biosynthesis stage of infection, the phage hijacks the host cell's machinery to replicate, transcribe, and translate the necessary viral components for the assembly of new viruses.
The translation of CII and CIII, which are viral proteins, is caused by the host cell's translation machinery. The host cell's ribosomes recognize the mRNA encoding CII and CIII, and using tRNA molecules, they assemble the corresponding amino acid sequences to synthesize these viral proteins.
These viral proteins play important roles in the production of new viruses and the lysis of the host cell to release the progeny viruses.