| A | B |
|---|
| organism | a complete living thing |
| cell | a tiny unit of living material surrounded by a thin membrane |
| cytoplasm | all the material inside a cell |
| unicellular | an organism composed only of one cell |
| multicellular | an organism composed of more than one cell; the individual cells are not able to live apart from the organism |
| tissue | a group of similar cells that together perform a specific function |
| colonial | a living thing that is composed of a group of similar cells living together; each cell capable of living individually |
| energy | the ability to do work |
| three parts of cell theory | 1. All cells come from preexisting cells. |
| four functions of cells | All cells use energy, All cells manufacture materials, All cells respond to their environment, All cells reproduce themselves |
| cell theory | the theory that all living things are made up of cells and that cells carry on the functions of living things |
| molecule | the smallest unit existing as a particular substance |
| carbohydrate | a substance that contains only hydrogen, carbon, and oxygen; ex: sugar or starch |
| protein | a substance made of long chains of amino acids; may serve as an enzyme or cellular building block; found in certain foods |
| nucleic acid | a molecule that contains the genetic infomation of a cell; DNA and RNA |
| lipid | a substance such as fat or oil; not soluble in water; an important component of membranes |
| four categories of molecules | carbohydrates, proteins, nucleic acids, |
