Concept:Viruses are acellular and do not possess a cell membrane.
Explanation:Plant cells, fungi cells, and animal cells are all eukaryotic cells.
Every eukaryotic cell has a plasma membrane surrounding its contents.
Plant cells additionally have a cell wall, chloroplasts, and a large vacuole.
Fungi cells additionally have a cell wall made of chitin.
Animal cells have only a cell membrane and membrane-bound organelles like mitochondria and the endoplasmic reticulum.
Viruses are not true cells.
A virus consists of genetic material (DNA or RNA) enclosed in a protein coat called a capsid.
Viruses lack a cell membrane, cytoplasm, and all cellular organelles.
They can reproduce only inside a host cell and are therefore obligate intracellular parasites.
Since viruses lack a membrane, they are the correct choice.
Answer:Option C: Viruses