Cells

4. The phase of mitosis in which the chromatin duplicates itself and thickens into chromosomes, the spindle fibers form, and the nuclear membrane disintegrates
5. The cell has a “skin” that separates its internal contents from the external environment. What is this?
6. The spherical organelle that is the cell's control center
9. Multi-layered organelle near the nucleus used for packaging of materials to be transported out of the cell.
11. Cellular division that yields two identical cells from one cell through a five-step process.
12. Multi-layered, sturdy structure composed of cellulose that provides plants and other organisms with their rigidity.

1. The green material found in chlor oplasts that is active in photosynthesis
2. Membrane-bound organelles containing chlorophyll that is found in photosynthetic organisms.
3. When the cell needs energy, the__________ produce energy from “food” that the cell takes in.
7. The energy produced is stored temporarily in the ____________
8. The double-helix molecule holding the genetic information of organisms that, along with protein, composes the chromatin
10. Extremely small grain-like organelle that provides the sites for protein synthesis