What part of the brain is highlighted in the diagram below? image is highlighting the section at the rear of the brain, found at the back of each hemisphere.

The highlighted part you are talking about is certainly the cerebellum. it is located in the posterior cranial fossa, below and at the back of the two hemispheres, it looks like a little brain.
Its most important roles consist in the handling of the equilibrium of the body and learning ability.

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When a virus infects a host cell, it uses the cell's machinery to make copies of its own genetic material in a process called replication. finally, during the process of self-assembly, that protein shell and the copies of the virus's genetic material are assembled into new viruses.