Across
- 4. theory - 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 homeostatis
- 6. - the cellular organelle that directs the protein-building process
- 10. - a protective coating found outside the cell walls of many bacteria
- 12. - (1) the membrane-bound region of a eukaryotic cell that contains the genetic material.(2) the central portion of an atom where protons and neutrons are located
- 14. - a cellular organelle that functions in the organization of microtubles
- 16. organism - an organism consisting of two or more cells and whose cells may not live independently apart from the organism
- 18. - a structure made of two or more tissues that work together to perform a particular function
- 20. - describes cells lacking a true nucleus and membrane-bound organelles
- 21. - the thick fluid inside cells that contains the organelles. also called the cytosol
- 22. pressure - the pressure exerted by water in a full central vacuole upon the cytoplasm and cell membrane of a plant cell; maintains plant rigidity
- 24. - a group of cells that are specialized to perform a particular function
- 27. organism - an organism consisting of only one cell
- 28. system - a group of two or more organs that work together to perform a particular function
Down
- 1. - a spherical structure within a eukaryotic cell's nucleus where ribosomes are manufactured
- 2. apparatus - the cellular organelle that processes and packages proteins in preparation for secreting them from a cell
- 3. - the genetic material of eukaryotic cells consisting of DNA and associated with proteins
- 5. - a cellular organelle that contains digestive enzymes
- 7. - the non-membrane-bound region in the prokaryotic cells that contains most of the genetic material
- 8. - a cellular organelle found in plant cells that contains the pigment chlorophyll and is the site where photosynthesis takes place
- 9. - a whip-like cellular organelle similar in structure to a cilium but longer and used primarily for movement in many bacteria
- 11. - a non-pigmented cellular organelle found in plant cells whose functions include storing starches, lipids, and proteins
- 13. endoplasmic reticulum - the cellular organelle that consists of a network of membranes used to transport substances throughout a cell and is studded with ribosomes
- 14. - (1) individual organisms in 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
- 15. vacuole - an organelle in plant cells that holds materials and helps maintain the cell's shape throughout turgor pressure
- 17. bilayer - the two layers of phospholipids that make up a cell membrane
- 19. - a stack of disk-shaped thylakoids within a chloroplast
- 21. wall - a rigid structure made by cells of plants, fungi, and most bacteria to surround the cell membrane
- 23. - structures found within the cytoplasm of cells that perform the various functions cells need to stay alive
- 25. endoplasmic reticulum - the cellular organelle that consists of a network of membranes used to transport substances throughout a cell and is not studded with ribosomes
- 26. - describes cells having a true nucleus as well as membrane-bound organelles