AP BIOLOGY

Detailed explanation-1: -Viruses rely entirely on their host as an energy source.

Detailed explanation-2: -Viruses are obligate intracellular parasites. They enter host cells, they use host cell machineries to replicate their genome and synthesize their proteins, and they produce progeny virions that are released in the extracellular environment.

Detailed explanation-3: -The topic of virus–host cell interactions spans all of virology and provides some of the most important insights into this field. Since viruses are intracellular parasites, they rely on their host cells for the energy, macromolecular synthesis machinery and the work benches for genome replication and particle assembly.

Detailed explanation-4: -Viruses cannot generate or store energy in the form of adenosine triphosphate (ATP), but have to derive their energy, and all other metabolic functions, from the host cell. They also parasitize the cell for basic building materials, such as amino acids, nucleotides, and lipids (fats).