Across
- 1. one of the fundamental models of biology that states that cells are the smallest form of life
- 5. the movement of substances across a cell membrane without the need for energy
- 8. a cellular signaling mechanism in which the product of a particular process enhances the process itself
- 9. a group of two or more organs that work together to perform a particular function
- 12. the genetic material of eukaryotic cells consisting of DNA and associated proteins
- 16. the pressure exerted by water in a full central vacuole upon the cytoplasm and cell membrane of a plant cell; maintains plant rigidity
- 18. the cellular organelle that processes and packages in preparation for secreting them from a cell
- 21. structure found within the cytoplasm of cells that perform the various functions cells need to stay alive
- 22. the non membranerbound region in prokaryotic cells that contains most of the genetic material
- 23. the cellular organelle that directs the protein-building process
- 24. an organism consisting of only two or more cells and whose cells may not live independently apart from the organism
- 27. a spherical structure within a eukaryotic cell's nucleus where ribosomes are manufactured
- 28. a cellular organelle that contains digestive enzymes
- 29. describes a solution whose solute concentration is equal to the solute concentration of a cytoplasm in a cell
- 32. a cellular signaling mechanism in which the product of a particular process inhibits the process itself
- 36. a stack of disk-shaped thylakoids within a chloroplast
- 38. the structure within cells that helps define their shape, maintain internal organization, and aids in division and movement
- 39. the internal balance within the systems of living organisms that must be kept stable in order to maintain life
- 40. a rigid structure made by cells of plants, fungi, and most bacteria to surround the cell membrane
- 41. the central portion of an atom where protons and neutrons are located
- 42. the movement of substances across a cell membrane from regions of low concentration to regions of high concentration by any means the requires the use of energy
Down
- 2. describes cells having a true nucleus as well as membranetbound organelles
- 3. describes a solution whose solute concentration is less than the solute concentration of the cytoplasm in a cell
- 4. describes a solution whose solute concentration is greater than the solute concentration of the cytoplasm in a cell
- 6. a thin layer of phospholipids and proteins that defines the boundary of a cell
- 7. describes cells lacking a true nucleus and membranetbound organelle
- 10. transports compounds around the cell and helps maintain the cell's shape; processes fats and breaks down toxic substances in liver cells
- 11. a cellular organelle found in plant cells that contain the pigment chlorophyll and is the site where photosynthesis takes place
- 13. an organelle in plant cells that holds materials and helps maintain the cell's shape through turgor pressure
- 14. transports compounds around the cell and helps maintain the cell's shape; is studded with ribosomes and processes the protein made by ribosomes
- 15. a protective coating found outside the cell calls for many bacteria
- 17. a structure made of two or more tissues that work together to perform a particular function
- 19. a type of passive transport in which substances can move across a cell membrane through special protein channels embedded in the membrane
- 20. the cellular organelle in which aerobic respiration takes place to release energy from food
- 25. a short hairlike extensions of a cell used either for movement or as a sensory organelle
- 26. the two layers of phospholipids that make up a cell membrane
- 30. the diffusion of water molecules through a semipermeable membrane
- 31. the thick fluid inside cells that contain the organelles
- 33. a cellular organelle that functions in the organization of microtubules
- 34. an organism consisting of only one cell
- 35. a non-pigmented cellular organelle found in plant cells whose functions include storing starches, lipids, and proteins
- 37. a whiplike cellular organelle similar in structure to a cilium but longer and used primarily for movement in many bacteria