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Unit 3-Cells

Vocabulary for the first part of the Cells unit.

TermDefinition
Cell The basic building blocks of living things
Organelle The parts of a cell. Each one has a specific function
Cell membrane A thin, flexible barrier around the outside of all cells. This organelle controls what enters and leaves the cell (selective permeability).
Cell Wall A thick protective layer around the outside of plant cells. This organelle gives plant cells a stiff and rigid shape.
Cytoplasm The liquid that fills the inside of cells.
Nucleus The control center of cells. Contains the DNA of the cell (in eukaryotic cells)
Chloroplast The organelle that absorbs sunlight and turns it into sugar (photosynthesis)
Mitochondria The organelle that converts sugar into ATP energy.
Ribosome This organelle creates proteins for the cell.
Vacuole The organelle that stores extra water, vitamins, and other materials.
Lysosome The organelle that removes waste from the cell.
Prokaryotic Cells that do not have a nucleus.
Eukaryotic Cells with a nucleus.
Unicellular Organisms made up of only one cell.
Multicellular Organisms made up of more than one cell.
Tissue A group of cells working together to perform a specific function.
Organ A group of tissue working together to perform a specific function.
Organ System A group of organs working together to perform a specific function.
Regulate To control something.
ATP energy The type of energy that living things need. Produced in the mitochondria by combining sugar and oxygen.
Selective Permeability Choosing what enters or leaves.
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