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Cells
Unit 2 vocab
12
Biology
9th Grade
09/24/2025

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Term
Cell
Definition
the basic unit of all living things
Term
Prokaryotic

cell
Definition
cells that are generally found in unicellular organisms and lack a nucleus
Term
Eukaryotic cell
Definition
cells that are generally found in multicellular organisms and contain a nucleus and other complex organelles
Term
Plant cell
Definition
Eukaryotic cell that has a cell wall, chloroplast, and a central vacuole, among other organelles
Term
Animal cell
Definition
Eukaryotic cell that has centrioles to aid in cell division as well as other membrane-bound organelles
Term
Organelle
Definition
a membrane-bound structure that is specialized to perform important cellular functions
Term
Unicellular organism
Definition
an organism consisting of a single cell
Term
Multicellular

organism
Definition
an organism that is made of many cells
Term
Spontaneous

generation
Definition
an early idea that living organisms came from nonliving things but has since been disproven
Term
Cell theory
Definition
the theory that states that: · all living organisms are composed of cells · cells are the basic units of life · cells come from other cells
Term
Endosymbiotic theory
Definition
Explains the evolution of organelles and eukaryotic cells · One cell engulfs another, and they form a symbiotic relationship
Term
Homeostasis
Definition
Ability to maintain stable conditions
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