What are the THREE parts of Cell Theory?, (1) All living things are made of cells. (2) The cell is the basic unit of life. (3) All cells come from pre-existing cells., Who discovered cells, when, and what did he look at?, Robert Hooke discovered cells in 1665 by looking at a piece of cork under a microscope., What is a cell?, The smallest basic unit of life. Cells are the building blocks of all living things., What is a unicellular organism? Give an example., An organism made of only ONE cell. All life functions happen in that one cell. Examples: bacteria, amoeba., What is a multicellular organism? Give an example., An organism made of MANY cells working together. Examples: humans, plants, animals., What is a prokaryotic cell?, A cell with NO nucleus. The DNA floats freely and is circular. Example: bacteria., What is a eukaryotic cell?, A cell WITH a nucleus that holds the DNA. Examples: animals, plants, fungi, protozoa., What are organelles?, The small parts inside a cell that each have a specific job — like tiny organs that keep the cell working..

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