| A | B |
| bacteria (singular: bacterium) | tiny one-celled organisms that do not have a nucleus |
| penicillin | the first antibiotic; developed in the 1940s |
| antibiotic | a medicine that kills bacteria and gets rid of infection |
| micro-organism | an organism that can be seen using a microscope, e.g. bacteria, viruses |
| microbe | another name for a micro-organism |
| virus | a tiny infectious particle that only survives inside a living organism |
| fungi | a type of organism that feeds and grows on other organisms, dead or alive |
| yeast | a one-celled micro-organism that is useful in making bread and beer |
| *nutrient agar | a substance used to grow microbes |
| *sterile / aseptic technique | technique used to prevent contamination of equipment with microbes; |
| *petri dish | a shallow glass or plastic round shallow dish used to grow microbes |
| *colony | a group of organisms of the same type living or growing together |