| A | B |
|---|
| cannot be broken down into simpler substances | element |
| two or more elements chemically combined | compound |
| smallest unit of compound | molecule |
| smallest unit of an element | atom |
| type of protein-speeds up chemical reaction | enzymes |
| only 20 of these-make thousands of proteins | amino acids |
| nucleic acid-genetic material | DNA |
| nucleic acid-production of proteins | RNA |
| cell membrane | selectively permeable |
| molecules move from higher to lower areas of concentration | diffusion |
| diffusion of water molecules | osmosis |
| diffusion and osmosis | passive transport |
| movement of materials using energy | active transport |
| "pick up" molecules to carry in and out of cells | transport proteins |
| surrounds particle, pinches off, forms vacuole | engulfing |
| what causes diffusion? | molecules bump into one another-'collisions' |
| fats, oils waxes | lipids |
| sugars and starches | carbohydrates |
| compounds that contain carbon | organic compounds |
| 4 main groups of organic molecules in living things | proteins, carbohydrates, lipids, nucleic acids |
