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Across 1. Thin flexible layer around the cells of all living things 9. A treatment which makes the body stronger against a particular infection 13. Transport of substances across a biological membrane from an area of higher concentration to an area of lower concentration by means of a carrier molecule 14. A process in which cell takes in materials from the outside by engulfing and fusing them with its plasma membrane 15. Microscopic parasite which can infect living organisms and cause disease 21. An organelle found in eukaryotic cells, it contains the majority of the cell's genetic material 22. One of two cycles of viral reproduction, a method by which a virus can replicate its DNA using a host cell 23. One of the two cycles of viral reproduction, it results in the destruction of the infected cell and its membrane 24. Any of the specialized structures within a cell that perform a specific function

Down 1. The process of particles moving through a solution or gas from an area with a higher number of particles to an area with a lower number of particles 2. Process by which a cell transports secretory products through the cytoplasm to the plasma membrane 3. Unicellular organisms that lack organelles or other internal membrane-bound structures 4. The outermost layer of cells 5. A movement of molecules across cell membranes without the need of energy input 6. The scientific process of transferring fluid between molecules 7. Engulfing of large particles, such as entire cells 8. Type of biological or synthetic, polymeric membrane that will allow certain molecules or ions to pass through it by diffusion 10. The ability to maintain a constant internal environment in response to environmental changes 11. A membrane-bound organelle found in the cytoplasm of eukaryotic cells, it is responsible for cellular respiration 12. Net movement of molecules from higher to lower concentration 16. Organelles found in plant cells and eukaryotic algae that conduct photosynthesis 17. Movement of molecules across a membrane from a lower to a higher concentration, requiring the consumption of energy 18. Basic structural unit of all known organisms 19. A living cell invaded by or capable of being invaded by an infectious agent 20. An organism whose cells contain a nucleus within a membrane