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Across 2. A "fals foot" or temporary bulge of cytoplasm used for feeding and movement in some protozoans. (p. 470) 4. A substance introduced into the body to stimulate the production of chemicals that destroy specific viruses, bacteria, or other disease-causing organisms. (p. 465) 7. The ability of bacteria to withstand the effects of an antibiotic. (p. 463) 10. A small, nonliving particle that invades and then reproduces inside a living cell.(p. 441) 11. An investigator who studies the occurance of disease in populations of people for the purpose of preventing or controlling health problems. (notes) 14. The process by which cells break down simple food molecules to release the energy they contain. (p. 451) 15. An organism that lives on or in a host and causes harm to the host. (p. 441) 16. An organism that breaks down large chemicals from dead organisms into small chemicals and returns important materials to the soil and water. (p. 456) 18. The study of how and why diseases or other health-related conditions are distributed in a population the way they are, in other words, why some people get sick and others do not. (notes) 21. The cell structure that collects extra water from the cytoplasm and then expels it from the cell. (p. 470) 25. A chemical that can kill bacteria without harming a person's cells. (p. 462) 26. A disease caused by the presence of a living thing in the body. (p. 460) 27. Someone who represents a group of people and their interests. (notes) 28. A virus that infects bacteria. (p. 441) 32. A eukaryotic organsim that cannot be classified as an animal, plant, or fungus. (p. 469) 34. An organism whose cells lack a nucleus and some other cell structures. (p. 449) 35. The hairlike projections on the outside of cells that move in a wavelike manner. (p. 471) 36. A small grain-like structure in the cytoplasm of a cell. (p. 449)

Down 1. A form of asexual reproduction in which one cell divides to form two identicle cells. (p. 452) 3. Study of the distribution of a disease or other health-related condition. Basis for forming hypotheses. (notes) 5. The reproductive process that involves only one parent and produces off spring that are identicle to the parent. (p. 452) 6. The pattern of how a sickness is sperad out among a group of people. (notes) 8. A poisn reproduced by bacterial pathogens that damages cells. (p. 461) 9. Something that helps to solve a problem or mystery. (notes) 12. An organism that cannot make its own food. (p. 409) 13. An animal-like protist. (p. 469) 17. A heating process where food is heated to a temperature that is high enough to kill most harmful bacteria without changing the taste of the food. (p. 455) 19. The process in which a unicellular organism transfers some of its genetic material to another unicellualr organism. (p. 452) 20. An educated guess. An unproven idea, based on observation or reasoning, that can be proven or disproven through investigation. (notes) 22. An organism that makes its own food. (p. 409) 23. A close relationship between two organisms in which at least one of the organisms benefits. ( p. 472) 24. A long, whiplike structure used for movement that extends out through the cell membrane and cell wall. (p. 449) 28. Single-celled organisms that lack a nucleus; prokaryote. (p. 449) 29. The region between the cell membrane and the nucleus. (p. 449) 30. A small, rounded, thick-walled, resting cell that forms inside a bacterial cell. (p. 453) 31. All the people in a particular group. (notes) 33. An organism that provides a source of energy or suitable environment for a virus or for another organism to live. (p. 441)