Cells are the fundamental units of life.Every living thing, from the simplest bacteria to complex humans, is composed of cells.Each cell contains organelles that perform specific functions, similar to organs in our body.The nucleus houses DNA, which contains genetic instructions for development and functioning.Mitochondria generate energy through cellular respiration.Ribosomes manufacture proteins essential for cell structure and function.Cells can be broadly categorized into two types.Prokaryotic cells and eukaryotic cells differ in their structure.Prokaryotic cells, like bacteria, have no nucleus, and their DNA floats freely in the cell.Eukaryotic cells, like those in plants and animals, contain a nucleus and membrane-bound organelles.Cells form the foundation of life, containing the DNA that we'll explore in our next section.
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