Biology Crossword

3. single-celled organism lacking a nucleus; the class of cell that includes all bacteria
6. organism whose cells contain nucleus
7. a symbiotic relationship in which one organism benefits and the other is harmed; example: dog and heartworms
8. animal that carries pathogens from person to person
9. symbiotic relationship in which one member of the association benefits and the other is neither helped nor harmed
10. anything that causes a mutation or change in DNA
12. a symbiotic relationship between two organisms in which both organisms benefit; example: clown fish and sea anemone
13. a substance needed for growth and repair
16. A form of technology that uses living organisms, usually genes, to modify products, to make or modify plants and animals, or to develop other microorganisms for specific purposes.
17. any microbe (virus, bacteria, fungus or organism) that can cause a disease
18. an organism that lives on or in a host and causes it harm
19. a tiny, nonliving particle that invades and then reproduces inside a living cell

1. a person who has some pathogen to which he is immune but who can pass it on to others
2. an outbreak of a disease that affects many people in an area
4. tiny one-celled organisms that lack a nucleus, some of which can cause diseases; come in three shapes (cocci, bacillus, and spirilia)
5. a substance that has been shown to cause cancer
11. an epidemic that spreads over a large area, or throughout the world
13. the process by which plants capture energy in sunlight and uses it to make food
14. the struggle between individuals of the same or different species for food, space, light, etc.
15. an infectious disease that can be transmitted or spread from one organism to another