Lipids concept map shows molecules that contains hydrocarbons and make up the building blocks. A lipid concept map template shows most of the cell membrane that is not made up of protein. A concept map is a graphic that depicts the connections between various concepts. This allows you to see how they are related. Every idea map is comprised of two basic elements: concepts that are often represented by circles, ovals, or boxes and are referred to as "nodes." Relationships are indicated by arrows that link the concepts, and the arrows frequently (but not always) include a connecting phrase or verb. These arrows are referred to as "cross-links."