How do cells get the energy that they need?

Cells get energy in the form of food molecules if they are animal cells or sunlight if they are plant cells. The process used by all cells to create usable energy is quite similar, no matter the source of the energy.

They have parts of the cell that feed them when for example a plant is in the sunlight it creates food of its own its called photosynthesis it uses glucose to create its food and oxegen.

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.