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</ Across 2. An extensive network of membranes that accounts for more than half the total membrane in many eukaryotic cells "_______ reticulum" 4. Outer surface lacks ribosomes. "______ ER" 8. Contains most of the genes in a eukaryotic cell 11. Has a true nucleus, bounded by a membranous nuclear envelope. "__________ cell" 13. Encloses the nucleus, separating its contents from the cytoplasm. "Nuclear _________" 14. A sac made out of membrane inside of cells 18. Used to study the internal ultrastructure of cells "_________ electron microscope" 19. A complex of protein and DNA that makes up chromosomes 21. A prominent structure within the nondividing nucleus where ribosomal RNA is synthesized 24. The discrete units of DNA that carry the genetic information; located inside the nucleus 26. DNA concentrated in a region called the nucleoid, but no membrane separates this region from the rest of the cell. "___________ cell" 30. The compartment of the mitochondria enclosed by the inner membrane; contains many different enzymes as well as the mitochondrial DNA and ribosomes. "_______________ matrix" 31. proteins that interact with the cytoskeleton for cell motility. "___________ proteins" 35. Take cells apart and separate the major organelles from one another. "Cell ______" 37. – locomotor appendages that protrude from some cells. "_____ and ______" (two words) 38. At the boundary of every cell; Functions as a selective barrier that allows sufficient passage of oxygen, nutrients, and wastes to service the entire volume of the cell (two words) 39. The ratio of an objects image size to its real size 42. Visible light is passed through the specimen and then through the glass lenses. The lenses refract the light in such a waythat the image of the specimen is magnified when projected. "_____ microscope" 43. Composed of nine sets of triplet microtubules arranged in a ring. Pairs of centrioles are within the centrosome of an animal cell (s) 46. especially useful for detailed study of the surface of a specimen. "_________ _________ microscope" (two words) 47. The center of manufacturing, warehousing, sorting, and shipping in a cell (two words)