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