Which of the following is not a component of an animal cell?

In an animal cell, the primary structural components include the cell membrane, mitochondria, and nucleus. The cell membrane serves as a protective barrier that controls the movement of substances in and out of the cell. Mitochondria are crucial organelles known as the "powerhouses" of the cell because they produce energy in the form of ATP through cellular respiration. The nucleus houses the cell's genetic material (DNA) and is responsible for regulating various cellular activities, including growth and reproduction.

The cell wall, however, is not a component of an animal cell. It is characteristic of plant cells, fungi, and some prokaryotes, providing structural support and protection. Therefore, the presence of a cell wall is a distinguishing feature of plant cells rather than animal cells, making it the correct choice for this question.