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Animal cells do not have cell walls because they do not need them. Cell walls, which are found in plant cells, maintain cell shape, almost as if each cell has its own exoskeleton. This rigidity allows plants to stand upr... More »

Animal cells contain structures such as lysosomes and centrioles that plant cells do not. Animal cells are also generally smaller and have more variety in shape than do plant cells. More »

Animal cells do not have a cell wall. Instead, animal cells have a cell membrane that protects the organelles inside of the cell and allows selective compounds to move in and out of the cell. More »

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Adenosine triphosphate, or ATP, is the energy currency of life, the way that individual cells store and use chemical energy. Any food or other source of energy a cell takes in is converted to ATP, in which form the mecha... More »

A good analogy for the cell wall is a sturdy fence or wall surrounding a castle, protecting the structure from harm and only allowing entrance by outsiders through specified gates and openings. In this scenario, the wall... More »

Biosynthetic capacity, the nature of cell division machinery and the fact that cells grouped together form various organs and structures are factors thought to influence and limit cell size in animals. The full extent of... More »

Because they are the energy-producing organelles in plant and animal cells, a high number of mitochondria implies that the cell requires a great deal of energy to perform its specific function. Skeletal muscle cells, for... More »