The specialized activities performed by a system, organ, body part, object, or device.

Single-celled organisms that do not have a nucleus or other membrane-bound organelles.

Cell structures, often surrounded by a separate membrane, that perform a specific function.

An organism made up of a single cell or many cells with a nucleus, and that is not an animal, plant, or fungus.

The parts of an object or system, including what they are made of, their shapes, and their arrangement.

A microbe that is not made of cells and cannot grow or reproduce outside of a living cell.

The structure that separates the cell from its external environment.

The outermost layer of certain cells that gives shape to the cell and protects it. Found in plant and bacterial cells.

A series of chemical reactions in a cell that break down sugars and release energy.

An organelle that contains chlorophyll and in which photosynthesis occurs. Found in plant cells and other photosynthesizing cells.

The material that fills much of the inside of cells.

The organelles that produce most of the energy that cells need.

The part of the cell that contains the genetic material.

The structure that separates the nucleus from the rest of the cell.

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Cells Unit

Term	Definition
Function	The specialized activities performed by a system, organ, body part, object, or device.
Bacteria	Single-celled organisms that do not have a nucleus or other membrane-bound organelles.
Organelles	Cell structures, often surrounded by a separate membrane, that perform a specific function.
Protist	An organism made up of a single cell or many cells with a nucleus, and that is not an animal, plant, or fungus.
Structure	The parts of an object or system, including what they are made of, their shapes, and their arrangement.
Virus	A microbe that is not made of cells and cannot grow or reproduce outside of a living cell.
Cell Membrane	The structure that separates the cell from its external environment.
Cell Wall	The outermost layer of certain cells that gives shape to the cell and protects it. Found in plant and bacterial cells.
Cellular Respiration	A series of chemical reactions in a cell that break down sugars and release energy.
Chloroplast	An organelle that contains chlorophyll and in which photosynthesis occurs. Found in plant cells and other photosynthesizing cells.
Cytoplasm	The material that fills much of the inside of cells.
Mitochondria	The organelles that produce most of the energy that cells need.
Nucleus	The part of the cell that contains the genetic material.
Nuclear Membrane	The structure that separates the nucleus from the rest of the cell.

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