Question

Which best explains why viruses do not have special structures or enzymes that allow them to make their own food?
Viruses can use energy of living cells that they infect.
Viruses can replicate inside a host that they infect.
Viruses can cause contagious illnesses in host cells.
Viruses integrate their RNA or DNA into infected cells.

Answer 1

"Viruses can use energy of living cells that they infect."

Explanation: Viruses are obligate intracellular parasites and lack metabolic machinery. They rely on host-cell enzymes and organelles for energy and biosynthesis, so they don't need their own structures or enzymes to make food.