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Across 4. organism that lives in or on another living thing and gets food from it 7. process of one organism dividing into two organisms 10. made of a chromosome-like part surrounded by a protein coat 14. the process of heating milk or other foods to kill harmful bacteria 17. organism that provides food for a parasite 18. chemical substances that kill or slow the growth of bacteria 19. reproducing of a living thing from only one parent

Down 1. organisms that use dead materials for food 2. sticky outer layer some bacteria have 3. living things that get their food from breaking down dead matter into simpler chemicals 5. a chemical substance that interferes with the way viruses reproduce 6. diseases that can be passed from one organism to another 8. small, one-celled monerans that contain chlorophyll and can make their own food 9. thick-walled structure that forms inside the cell, enclosing all the nuclear material & some cytoplasm 11. steps for proving that a disease is caused by a certain microscopic organism 12. substances made from weakened or dead viruses, used to prevent disease 13. the use of living things to solve practical problems 15. long, whiplike thread some bacteria use to move 16. very small, one-celled monerans