| A | B |
|---|
| Cell | the smallest unit that can perform all life processes |
| Cell membrane | a phospholipid layer that covers a cell's surface; acts as a barrier between the inside of a cell and the cell's environment |
| Organelle | One of the small bodies in a cell's cytoplasm that are specialized to perform a specific function |
| Nucleus | In a eukaryotic cell, a membrane-bound organelle that contains the cell's DNA and that has a role in processes such as growth, metabolism, and reproduction |
| Prokaryotes | single-celled organisms that do not have a nucleus or membrane bound organelles |
| Eukaryotes | An organism made up of cells that have a nucleus enclosed by a membrane |
| Cell wall | a rigid structure that surrounds the cell membrane and provides support to the cell |
| Ribosomes | Cell organelle composed of RNA and protein |
| Endoplasmic reticulum | A system of membranes that is found in a cell's cytoplasm and that assists in the production, processing, and transport of proteins and in the production of lipids |
| Mitochondrion | The cell organelle that is surrounded by two membranes and that is the site of cellular respiration |
| Golgi complex | cell organelle that helps make and package materials to be transported out of the cell |
| Vesicle | A small cavity or sac that contains materials in a eukaryotic cell |
| Lysosome | A cell organelle that contains digestive enzymes |
| Tissue | A group of similar cells that perform a common function |
| Organ | A collection of tissues that carry out a specialized function of the body |
| Organ system | a group of organs that work together to perform body functions |
| organisms | a living thing; anything that can carry out life processes independently |
| structure | the arrangement of parts in an organism |
| function | the special, normal, or proper activity of an organ or part |
