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Across 3. a complex of vesicles and folded membranes within the cytoplasm of most eukaryotic cells, involved in secretion and intracellular transport. 6. the material or protoplasm within a living cell, excluding the nucleus. 8. a minute particle consisting of RNA and associated proteins, found in large numbers in the cytoplasm of living cells. They bind messenger RNA and transfer RNA to synthesize polypeptides and proteins 9. a rigid layer of polysaccharides lying outside the plasma membrane of the cells of plants, fungi, and bacteria. In the algae and higher plants, it consists mainly of cellulose. 10. the semipermeable membrane surrounding the cytoplasm of a cell 11. the central and most important part of an object, movement, or group, forming the basis for its activity and growth. 12. any of the distinct types of material of which animals or plants are made, consisting of specialized cells and their products.

Down 1. a part of an organism that is typically self-contained and has a specific vital function, such as the heart or liver in humans. 2. 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. 4. any of a number of organized or specialized structures within a living cell. 5. a plastid that contains chlorophyll and in which photosynthesis takes place. 7. 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