Across
- 4. light-absorbing pigment in plants and some protists that is required for photosynthesis; absorbs most wavelengths of light except for green.
- 5. clear, gelatinous fluid in eukaryotic cells that suspends the cell's organelles and is the site of numerous chemical reactions.
- 9. organelle in eukarotic cells with a series of highly folded membranes surrounded in cytoplasm; site of cellular chemical reactions; can either be rough (with ribosomes) or smooth (without ribosomes).
- 11. unicellular or multicellular organisms, such as yeast, plants, and animals, composed of eukaryotic cells, which contain a true nucleus and membrane-bound organelles.
- 12. feature of the plasma membrane that maintains homeostasis within a cell by allowing some molecules into the cell while keeping others out.
- 13. basic unit of all organisms; all living things are composed of cells.
- 15. stuctural model of the plasma membrane where molecules are free to move sideways within a bilayer.
- 16. thin,solid protein fibers that provide structural support for eukaryotic cells.
- 17. proteins that span the plasma membrane creating a selectively permeable membrane that regulates which molecules enter and leave a cell.
- 18. short, numerous, hairlike projections composed of pairs of microtubules; frequently move in a wavelik motion; aid in feeding and locomotion.
- 19. organelles that contain digestive enzymes; digest excess or worn out organelle, food particles, and engulfed viruses or bacteria.
- 21. eukaryotic membrane-bound organelles that transform energy stored in food molecules into ATP, has a highly folded inner membrane that produces energy-storing molecules,
- 24. nonmembrane-bound organelles in the nucleus where enzymes and other proteins are assembled.
- 25. serves as boundary between the cell and its environment; allows materials such as water and nutrients to enter and waste products to leave.
- 27. chlorophyll-containing cell organelles found in the cells of green plants and some protists; captures light energy from the sun, which is converted to chemical energy in food molecules.
- 28. group of plant organelles that are used for storage of starches, lipids, or pigments.
- 29. unicellular organisms, such as bacteria, composed of prokaryotic cells; Prokaryotuc cells lack membrane-bound structures.
- 31. firm,fairly rigid structure located just outside the plasma membrane of plants, fungi, most bacteria, and some protists; provides support and protection.
- 32. long, hairlike projections composed of pairs of microtubules; found on some cell surfaces; they help propel cells and organisms by a whiplike motion.
Down
- 1. organelle in eukaryotic cell nucleus that produces ribosomes.
- 2. instrument that uses visible light to magnify objects in steps; can magnify an object up to 1,500 times its original size.
- 3. cellular framework found within the cytoplasm composed of microtubules and microfilaments
- 6. instruent that uses a beam of electrons instead of natural light to magnify structures up to 500,000 times its actual size; allows scientists to view structures within a cell.
- 7. membrane-bound fluid-filled space in the cytoplasm of plant cells used for the temporary storage of materials.
- 8. lipids within an attached phosphate group; plasma membranes are composed of phospholipid bilayer with embedded proteins.
- 10. in eukaryotic cells, the central membrane-bound organelle that manages cellular functions and contains DNA.
- 14. organelle in eukaryotic cells with astste, of flattened tubular membranes; modifies proteins and sends them to their appropriate destinations.
- 20. thin, hollow cylinders made of protein that provide structural support for eukaryotic cells.
- 22. organism's regulation of its internal environment to maintain conditions suitable for survival; a characteristic of all living things; process of maintaining equilibrium in an organism's internal environment.
- 23. long, tangled strands of DNA found in the eukayotic cell nucleus during interphase.
- 26. the theory that all organisms are composed of cells,the cell is the basic unit of organization of organisms, and all cells come from pre-existing cells.
- 30. membrane-bound structures within eukaryotic cells.