| A | B |
|---|
| Molecule | Two or more atoms linked together to make a substance with unique properties. |
| DNA molecule | Shaped like a double helix. |
| Atom | The smallest chemical unit of matter. |
| Nucleotides | The little units attached to each strand in the DNA molecule. |
| DNA sequence | Only adenine and thymine can link together, and only cytosine and guanine can link together. |
| Backbone | The two long strands of atoms linked together in just the right way forming a double helix. |
| Glucose | The name of the chemical that plants make for food and is considered an energy source. |
| Starch | A complex carbohydrate that is stored and used as food/energy for plants and animals. |
| Photosynthesis | The process by which green plants and some other organisms use the energy of sunlight and simple chemicals to produce their own food. |
| Metabolism | The sum total of all processes in an organism that convert energy and matter from outside sources and use that energy and matter to sustain the organism's life functions. |
| Receptors | Special structures that allow living organisms to sense the conditions of their internal or external environment. |
