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Unit 1 Cells

Characteristics of Cells

TermDefinition
Cell the smallest functional and structural unit of all living things
Organism any living thing
Cell membrane a protective layer that covers a cell's surface and acts as a barrier between the inside of a cell and the cell's environment
Cytoplasm the region enclosed by the cell membrane that includes the fluid and all of the organelles of the cell
Organelle a small body in a cells cytoplams that is specialized to perform a specific function
Nucleus where DNA is located in Eukaryote
Prokaryote a single celled organism that does not have a nucleus or membrane bound organelles. Its DNA is located in the cytoplasm. ex: bacteria, archaea
Eukaryote an organism made up of cells that contain their DNA in a nucleus. ex: animals, plants, protists, and fungi
Robert Hooke First person to describe cells. He built a microscope to look at tiny objects.
Cell theory Three basic characteristics of all cells and organisms: All organisms are made up of one or more cells The cell is the basic unit of all organisms All cells come from existing cells
Anton van Leeuwenhoek The first person to describe actual living cells when he looked at a drop of pond water under a microscope.
Unicellular organisms made up of only one cell the single cell must carry out all of the functions for life
Multicellular organisms made up of more than one cell the cells often have specialized functions
Created by: Mrs Lyons
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