All living organisms are made up of tiny units called ____. A basic animal cell has three main structures: Cell ____ controls which substances can enter and leave a cell. ____ controls cell activity. ____ is where some of the chemical reactions of the cell occur. In addition to the cell membrane, nucleus and cytoplasm, a basic plant cell has three additional structures: Cell ____ provides support. ____ stores the cell sap. ____ allow plants to trap sunlight and make food (sugar) through a process called photosynthesis. Some organisms are ____ (made of only one cell), whereas other organisms are multicellular. ____ organisms are made up of many different types of cells.

Cell Structure

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