Across
- 4. a long, hairlike structure that grows out of a cell and enables the cell to move
- 7. a fiber found inside eukaryotic cells that is composed mainly of the protein actin and that has a role in cell structure and movement
- 8. a hairlike structure arranged in tightly packed rows that projects from the surface of some cells
- 9. an organelle of plant cells that contains specific substances and performs specific functions for the cell
- 11. a large cavity or sac that is found in plant cells or protozoans and that contains air or partially digested food
- 18. a rigid structure that surrounds the cell membrane and provides support to the cell
- 19. the theory that states that all living things are made up of cells, that cells are the basic units of organisms, that each cell in a multicellular organism has a specific job, and that cells come only from existing cells
- 22. a cell organelle that contains digestive enzymes
- 24. one of the small, tubular fibers composed of the protein tubulin that are found in the cytoplasm of eukaryotic cells, that compose the cytoskeleton, and that play a role in cell structure and movement
- 25. a cell organelle that helps make and package materials to be transported out of the cell
- 26. one of the small bodies that are found in the cytoplasm of a cell and that are specialized to perform a specific function
- 28. a system of membranes that is found in a cell's cytoplasm and that assists in the production, processing, and transport of proteins and in the production of lipids
- 30. or cell membrane, the cell's outer boundary
- 31. the region of the cell within the membrane that includes the fluid, the cytoskeleton, and all of the organelles except the nucleus
- 32. in a eukaryotic cell, one of the structures in the nucleus that are made up of DNA and protein; in a prokaryotic cell, the main ring of DNA
- 33. a double layer of phospholipids that makes up plasma and organelle membranes
Down
- 1. the cytoplasmic network of protein filaments that plays an essential role in cell movement, shape, and division
- 2. a group of organs that accomplish related tasks
- 3. an organelle that is active during mitosis
- 5. in eukaryotic cells, the cell organelle that is surrounded by two membranes and that is the site of cellular respiration, which produces ATP
- 6. a cell organelle composed of RNA and protein; the site of protein synthesis
- 10. in biology, the smallest unit that can perform all life processes; cells are covered by a membrane and contain DNA and cytoplasm
- 12. the soluble portion of the cytoplasm, which includes molecules and small particles, such as ribosomes, but not the organelles covered with membranes
- 13. an organism made up of cells that have a nucleus enclosed by a membrane, multiple chromosomes, and a mitotic cycle; eukaryotes include protists, animals, plants, and fungi but not archaea or bacteria
- 14. a single-celled organism that does not have a nucleus or membrane-bound organelles; examples are archaea and bacteria
- 15. an organelle found in plant and algae cells where photosynthesis occurs
- 16. a green pigment that is present in most plant and algae cells and some bacteria, that gives plants their characteristic green color, and that absorbs light to provide energy for photosynthesis
- 17. the part of the eukaryotic nucleus where ribosomal RNA is synthesized
- 20. a group of similar cells that perform a common function
- 21. the double membrane that surrounds the nucleus of a eukaryotic cell
- 23. a collection of tissues that carry out a specialized function of the body
- 27. in physical science, an atom's central region, which is made up of protons and neutrons
- 29. a membrane system found within chloroplasts that contains the components for photosynthesis