Across
- 4. the internal balance of living organisms that must be kept stable in order to maintain life. Processes that maintain homeostasis include getting nutrition, expelling wastes, and responding to the environment
- 6. a type of passive transport in which substances can move across a cell membrane through special protein channels embedded in the membrane
- 8. describes a solution whose solute concentration of the cytoplasm in a cell
- 10. a spherical structure within a eukaryotic cell's nucleus where ribosomes are manufactured
- 11. the two layers of phospholipids that make up a cell membrane
- 12. structures found within the cytoplasm of cells that perform the various functions cells need to stay alive
- 13. a stack of disk-shaped thylakiods within a choroplast
- 15. transports compounds around the cell and helps maintain the cell's shape; processes fats and breaks down toxic substances in liver cells
- 18. one of the fundamental models of biology that states that cells are the smallest form of life, come from preexisting cells, are the basic building block of all life forms, and carry out life processes to maintain homeostasis.
- 19. the pressure extended by water in a full central vacuole upon the cytoplasm and cell membrane of a plant cell; ,maintains plant rigidity
- 21. a protective coating found outside the cell walls of many bacteria
- 22. a non-pigmented cellular organelle found in plant cells whose functions include storing starches, lipids, and proteins
- 25. an organism consisting of only one cell
- 27. describes cells lacking a true nucleus and membrane-bound organelles
- 29. describes cells having a true nucleus as well as membrane-bound organelles
- 30. a structure made of two or more organs that work together to perform a particular function
- 33. (1)individual organisms of the same species living closely together.(2) a group of cells that live and work together. Unlike in a multicellular organism, cells in a colony may break away and survive on their own.
- 35. the structure within cells that helps define their shape, maintains internal organization, and aids in division and movement.
- 38. transports compounds around the cell and helps maintain the cell's shape; is stubbed with ribosomes and processes the proteins made by ribosomes
- 40. a cellular organelle found in plant cells that contains the pigment chlorophyll and is the site where photosynthesis takes place
- 41. a cellular signaling mechanism in which the product of a particular process inhibits the process itself
- 42. a cellular signalling mechanism in which the product of a particular process enhances the process itself
Down
- 1. the genetic material of eukaryotic cells consisting of DNA and associated proteins
- 2. the cellular organelle in which aerobic respiration takes place to release energy from food
- 3. the cellular organelle that directs the protein building process
- 5. an organism consisting of two or more cells and whose cells may not live independently apart from the organism
- 7. an organelle in plant cells that holds materials and helps maintain the cell's shape through turgor pressure
- 9. a group of two or more organs that work together to perform a particular function
- 14. a cellular organelle that contains digestive enzymes
- 16. the cellular organelle in which aerobic respiration takes place to release energy from food
- 17. the movement of substances across a cell membrane without the need for energy
- 20. a whip-like cellular organelle similar in structure to a cilium but longer and used primarily for movement in many bacteria
- 23. the diffusion of water molecules through a semipermasemipermeableic membrane
- 24. a cellular organelle that functions in the organization of microtubules
- 26. describes a solution whose solute concentration is greater than the solute concentration of the cytoplasm in a cell
- 28. the cellular organelle that processes and packages proteins in preparation for secreting them from a cell
- 31. (1)the membrane-bond region of a eukaryotic cell that contains the genetic material.(2) the central portion of an atom where protons and neutrons are located.
- 32. a thin layer of phospholipids and proteins that defines the boundary of a cell
- 34. 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
- 36. structures found within the cytoplasm of cells that perform the various functions cells need to stay alive
- 37. the non-membrane-bound region in prokaryotic cells that contains the most of the genetic material
- 39. a rigid structure made by cells of plants, fungi, and most bacteria to surround the cell membrane