Cells

1. It protects the plant cell and maintains its shape.
3. They are cellular organelles where cellular respiration occurs.
5. It helps to maintain chemical environments inside the organelles that are different from the environment of the rest of the cell.
6. A organelle found in some plant cells and certain unicellular organisms where photosynthesis takes place.
7. A ball-like mass of fibers and granules in a cell nucleus.
8. It is a cellular organelle that modifies, stores, and routes cell products.
10. It is a cell that lacks a nucleus and most other organelles.
12. It is a system of membranous tubes and sacs containing ribosomes which function in the manufacture of membrane-bound proteins.
14. It is a cell that has a nucleus surrounded by its own membrane, and has other internal organelles bounded by membranes.
17. A microscopic network of protein filaments and tubules in the cytoplasm of many living cells, giving them shape and coherence.
18. A membrane-bound sac containing digestive enzymes that can break down proteins, nucleic acids, and polysaccharides.

1. Each of the two threadlike strands into which a chromosome divides longitudinally during cell division. Each contains a double helix of DNA.
2. It is a system of membranous tubes and sacs that functions in lipid synthesis.
4. It surrounds the nucleus.
9. A threadlike structure of nucleic acids and protein found in the nucleus of most living cells, carrying genetic information in the form of genes.
11. It houses the cell's genetic material in the form of DNA.
13. A membrane-bound sac that buds from the endoplasmic reticulum or the Golgi apparatus.
15. A cluster of proteins and nucleic acids that constructs proteins in a cell.
16. A thin membrane (a double layer of lipids) enclosing the cytoplasm of a cell; proteins in the membrane control passage of ions (like sodium or potassium or calcium) in and out of the cell.