| A | B |
|---|
| prokaryotes | organisms whose cells have NO membrane-bound nucleus |
| Gram-staining | using dyes to stain bacterial cell walls for identification and diagnosis |
| autotrophs | organisms that can make their own food |
| heterotrophs | organisms that cannot make their own food |
| decomposers | organisms that return nutrients to the environment by breaking down organic matter |
| nitrogen-fixing bacteria | change atmospheric nitrogen into a form that plants can use |
| pathogen | a disease-causing agent |
| dehydration | drastic loss of water from the body |
| pasteurization | using heat to kill pathogenic bacteria |
| vaccine | solution of harmless pathogens or their toxins |
| antibiotics | drugs that prevent bacteria from making new cell walls |
| viruses | microscopic particles that invade cells of other organisms |
| HIV | virus that causes AIDS |
| AIDS | Acquired Immune Deficiency Syndrome |
| penicillin | first antibiotic; discovered by Alexander Fleming |
