Across
- 4. An atom that is the basic building block of life
- 5. A reproductive cell with a tail for swimming
- 8. A highly contagious virus that causes a red rash
- 9. A Y-shaped protein used to fight viruses
- 10. A molecule made of hydrogen and oxygen; makes up most of a cell
- 11. A virus that looks like a robot spider and attacks bacteria
- 13. The group of tiny, simple organisms that includes E. coli
- 15. A rod-shaped bacteria found in the human intestine
Down
- 1. The virus that causes the common cold
- 2. The scientific name for a simple cell with no nucleus
- 3. The virus responsible for the seasonal flu
- 6. A cell covered in tiny hairs called cilia
- 7. A pond organism that moves by oozing "false feet"
- 12. A simple sugar molecule used for energy
- 14. The largest human cell; it is visible to the naked eye