Cells

2. mall, membrane-enclosed organelles that contain enzymes involved in a variety of metabolic reactions, including several aspects of energy metabolism.
7. a network of membranous tubules within the cytoplasm of a eukaryotic cell, continuous with the nuclear membrane. It usually has ribosomes attached and is involved in protein and lipid synthesis.
10. the structure in a cell that contains the chromosomes.
11. a membrane-bound cell organelle that contains digestive enzymes.
12. a small dense spherical structure in the nucleus of a cell during interphase.
14. a slender threadlike structure, especially a microscopic appendage that enables many protozoa, bacteria, spermatozoa
15. a microscopic membrane of lipids and proteins which forms the external boundary of the cytoplasm of a cell or encloses a vacuole, and regulates the passage of molecules in and out of the cytoplasm.

1. a minute cylindrical organelle near the nucleus in animal cells, occurring in pairs and involved in the development of spindle fibers in cell division.
2. a protein complex in cells containing proteases; it breaks down proteins that have been tagged by ubiquitin.
3. the fluid portion of the cytoplasm exclusive of organelles and membranes.
4. a complex of vesicles and folded membranes within the cytoplasm of most eukaryotic cells, involved in secretion and intracellular transport.
5. a small sac formed by a membrane and filled with liquid.
6. tiny finger-like projections found on the surface of certain cells.
8. an organelle found in large numbers in most cells, in which the biochemical processes of respiration and energy production occur. It has a double membrane, the inner layer being folded inward to form layers (cristae).
9. a minute particle consisting of RNA and associated proteins found in large numbers in the cytoplasm of living cells
13. a cell that is capable of lashing movement and serves especially in free unicellular organisms to produce locomotion or in higher forms a current of fluid.