| A | B |
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| organism | any individual living thing, made up of one or more cells that is capable of growing and reproducing |
| unicellular | a term used to describe an organism that is made up of a single cell |
| multicellular | a term used to describe an organism that is made up of many cells |
| microscope | an instrument that uses glass lenses to magnify an object |
| bacteria | a large group of one-celled organisms that sometimes cause disease |
| eukaryotic cell | a cell in which the genetic material is enclosed within a nucleus, surrounded by its own nuclear membrane |
| prokaryotic cell | a cell that lacks a nucleus and other organelles, with DNA that is not organized into chromosomes |
| organelle | a structure in a cell that is enclosed by a membrane and that performs a particular function |
| cell membrane | the outer boundary of the cytoplasm, a layer that controls what enters or leaves the cell |
| cytoplasm | a thick, jelly-like material contained within the cell membrane. Most of the cell's work is carried out here |
| nucleus | the structure in a eukaryiotic cell that contains the genetic material a cell needs to reproduce and function |
| cell wall | a protective outer covering that lies just outside the cell membrane of plant cells |
| chloroplast | an organelle in a plant cell that contains chlorophyll, a chemical that uses energy from sunlight to make sugar |
| mitochondria | organelles that release energy by using oxygen to break down sugars |
| ribosomes | organelles that make proteins for use by the cell |
| specialization | the specific organization of a cell and its structures that allow it to perform a specific function |
| tissue | a group of similar cells that are organized to do a specific job |
| organ | a structure in a plant or animal that is made up of different tissues working together to perform a particular function |
