6th SCI #2 Unit #2

Term Definition
multicellular an organism made up of more than one, often different, cells
unicellular an organism made up of one cell
cell basic structural and functional unit in living organisms
organelle membrane-bound structure inside a cell that has a particular function
cell theory theory that states the cell is the basic unit of all living things
prokaryote organism whose cells lack a true nucleus and membrane-bound organelles
eukaryote organism whose cells have a true nucleus and membrane-bound organelles
cell membrane a lipid barrier that encloses the cytoplasm and controls what enters and exits the cell
nucleus a membrane-bound structure in eukaryotic cells that contains the DNA
chloroplasts a membrane-bound organelle in some cells that is the site of photosynthesis
cell wall surrounds the cell membrane of a plant to give structure and protection to the cell
mitochondria organelle in the cytoplasm of eukaryotic cells that functions in energy production – the power factory of the cell
structure parts that make up an organism and are made of cells
tissue groups of specialized cells that an organism has
organ groups of specialized tissues that an organism has
specialized made to perform one function
system multiple parts working together for one purpose
organ system two or more organs working together for the same purpose
organism single self-contained living thing
cytoplasm think, jelly-like liquid that surrounds the organelles within a cell
structure arrangement and relationships between parts that make up an organism (how something is built)
function the specific job a structure is designed to do

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