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By: Patty Harris W.L. Swain Elementary Organisms contain cells, such as blood cells. Organisms are mostly made up of cells that work together Cells are too small and numerous to observe. Many cells such as onion skin cells and cheek cells can be viewed with magnification. Many cells cannot be seen with the naked eye. Animal and plant cells are structured differently Organisms can be single-celled or multi-celled Some objects are too small to be seen without magnification. Microscopes make it possible to see that living things are made up mostly of cells. Some organisms’ cells vary greatly in appearance and perform very different roles in the organisms. Some organisms are made of a collection of similar cells that benefit from cooperating. DNA is contained in the nucleus of the cell. Bacteria does not have a nucleus. Multi-celled organisms have groups of cells that work together to form tissues and organs. A virus is not a cell, but it can reproduce. Cells are the building blocks of life. All living things are made of cells. Robert Hooke was the first person to discover cells.