Across
- 3. heterotrophs that feed by absorbing food through their cell walls
- 5. an organism that is able to capture energy from sunlight or chemicals and use it to produce its own food
- 8. rod-shaped organelles that convert energy in food molecules to energy the cell can use to carry out its functions
- 9. agent:
- 10. the condition in which an organism’s internal environment is kept stable in spite of changes in the external environment
- 12. single-celled organisms that lack a nucleus; prokaryotes
- 15. consisting of many cells
- 16. cell (___): the series of events in which a cell grows, prepares for division, and divides to form two daughter cells
- 18. a sac-like organelle that stores water, food, and other materials
- 20. an organism that benefits by living with, on, or in a host in a parasitism interaction
- 24. a tiny, nonliving particle that enters and then reproduces inside a living cell
- 26. ___ generation: the mistaken idea that living things arise from nonliving sources
- 28. the process of grouping things based on their similarities
- 30. an organism that cannot make its own food, but gets food by consuming other living things
Down
- 1. the process by which molecules move from an area of higher concentration to an area of lower concentration
- 2. an action or change in behavior that occurs as a result of a stimulus
- 4. the most basic level of organization in the classification of organisms
- 6. made of a single cell
- 7. ___ nomenclature: the classification system in which each organism is given a unique, two-part scientific name indicating its genus and species
- 11. a body structure that is composed of different kinds of tissues that work together
- 13. the thick fluid region of a cell located inside the cell membrane (in prokaryotes) or between the cell membrane and nucleus (in eukaryotes)
- 14. in cells, a large oval organelle that contains the cell’s genetic material in the form of DNA and controls man of the cell’s activities
- 16. an organelle in the cells of plant and some other organisms that captures energy from sunlight and changes it to an energy form that cells can use in making food
- 17. cell (___): a thin,, flexible barrier that surrounds a cell and controls which substances pass into and out of a cell
- 19. a group of similar cells that perform a specific function
- 21. a living thing
- 22. cell (___): a rigid supporting layer that surrounds the cells of plants and some other organisms
- 23. the basic unit of structure and function in living things
- 25. any change or signal in the environment that can make an organism react in some way
- 27. organ (___): a group of organs that work together to perform a major function
- 29. cell (___): a widely accepted explanation of the relationship between cells and living things. All living things are made of cells; Cells are the basic units of structure and function in living things; and All new cells are produced from existing cells
- 31. a tiny cell structure that carries out a specific function within the cell