Animal cells do not require a cell wall because they do not need the additional structural support provided by a rigid cell wall, as they are supported by the extracellular matrix. Animal cells also need to be more flexible and able to change shape for various functions such as movement, which a cell wall would hinder. Additionally, the absence of a central vacuole in animal cells is due to their smaller size and more specialized functions compared to plant cells, which often require a central vacuole for storing water, nutrients, and waste products. Instead, animal cells have smaller vacuoles scattered throughout the cytoplasm for specific functions such as storage and excretion.
in 3 to 5 sentences compare the processes of digesting food in an amoeba (unicellular) in a mouse
The process of digesting food in an amoeba (unicellular organism) differs from that in a mouse (multicellular organism). Amoebas take in solid food through phagocytosis, where the food is engulfed by the cell membrane and formed into a food vacuole. The enzymes produced by the cell then break down the food inside the vacuole. In mice, digestion begins in the mouth, where the teeth mechanically break down food, and saliva contains enzymes that start chemical digestion. The food then moves to the stomach, where it is further broken down by stomach acids and digestive enzymes. Finally, in the small intestine, nutrients are absorbed into the bloodstream for use in the body.
Animal cells do not require a cell wall because they have a flexible plasma membrane that allows for flexibility and movement. This flexibility enables animal cells to change shape and interact with their environment. Additionally, animal cells do not have a central vacuole because they do not rely on storage of water or nutrients like plant cells do. Instead, animal cells have smaller vacuoles that perform specific functions, such as transport and storage of molecules.
Animal cells do not require a cell wall because they are surrounded by a flexible plasma membrane that allows for movement and flexibility. Unlike plant cells, animal cells do not need to maintain a rigid structure for support or protection. Additionally, animal cells do not possess a central vacuole because their main functions are typically performed by other structures such as lysosomes, which aid in digestion and waste removal.
