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Cells are the basic building blocks of all living organisms, from single-celled bacteria to multicellular plants and animals. Cells are grouped into two main categories: prokaryotic and eukaryotic.

Prokaryotes are simple, single-celled organisms that lack membrane-bound organelles. Their DNA is located in a region called the nucleoid, which is not surrounded by a membrane.

Eukaryotes can be single-celled or multicellular, and their cells always have a membrane-bound nucleus. These cells have a more complex structure organized into membrane-bound organelles, such as mitochondria and the endoplasmic reticulum, which carry out specific functions.

Eukaryotic organisms, such as plants and animals, differ in some features. For example, a typical plant cell contains a rigid cell wall and chloroplasts, while an animal cell does not.

Overall, learning about cell structure and function helps us understand how living organisms work.