science

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Across
  1. 2. a complex of vesicles and folded membranes within the cytoplasm of most eukaryotic cells, involved in secretion and intracellular transport.
  2. 3. a dense organelle present in most eukaryotic cells, typically a single rounded structure bounded by a double membrane, containing the genetic material.
  3. 5. the semipermeable membrane surrounding the cytoplasm of a cell.
  4. 6. (in green plant cells) a plastid that contains chlorophyll and in which photosynthesis takes place.
  5. 10. an organelle in the cytoplasm of eukaryotic cells containing degradative enzymes enclosed in a membrane.
  6. 11. (of a material or membrane) allowing liquids or gases to pass through it.
  7. 12. a space or vesicle within the cytoplasm of a cell, enclosed by a membrane and typically containing fluid.
  8. 13. 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. 14. 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. 15. a scientific theory first formulated in the mid-nineteenth century, that living organisms are made up of cells, that they are the basic structural/organizational unit of all organisms, and that all cells come from pre-existing cells.
Down
  1. 1. 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.
  2. 4. the material or protoplasm within a living cell, excluding the nucleus.
  3. 5. a microscopic network of protein filaments and tubules in the cytoplasm of many living cells, giving them shape and coherence.
  4. 6. a small room in which a prisoner is locked up or in which a monk or nun sleeps.
  5. 7. any of a number of organized or specialized structures within a living cell.
  6. 8. (of a material or membrane) allowing certain substances to pass through it but not others, especially allowing the passage of a solvent but not of certain solutes.
  7. 9. 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).
  8. 10. a thin polar membrane made of two layers of lipid molecules.