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Across 2. An organelle found in eukaryotic cells, it contains the majority of the cell's genetic material 3. One of two cycles of viral reproduction, a method by which a virus can replicate its DNA using a host cell 6. A treatment which makes the body stronger against a particular infection 8. Any of the specialized structures within a cell that perform a specific function 10. Type of biological or synthetic, polymeric membrane that will allow certain molecules or ions to pass through it by diffusion 15. A membrane-bound organelle found in the cytoplasm of eukaryotic cells, it is responsible for cellular respiration 16. An organism whose cells contain a nucleus within a membrane 18. Basic structural unit of all known organisms 19. Engulfing of large particles, such as entire cells 20. 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 22. One of the two cycles of viral reproduction, it results in the destruction of the infected cell and its membrane 23. The ability to maintain a constant internal environment in response to environmental changes 24. Movement of molecules across a membrane from a lower to a higher concentration, requiring the consumption of energy 25. A living cell invaded by or capable of being invaded by an infectious agent

Down 1. Thin flexible layer around the cells of all living things 4. 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 5. Unicellular organisms that lack organelles or other internal membrane-bound structures 7. The outermost layer of cells 9. Net movement of molecules from higher to lower concentration 11. A movement of molecules across cell membranes without the need of energy input 12. Organelles found in plant cells and eukaryotic algae that conduct photosynthesis 13. A process in which cell takes in materials from the outside by engulfing and fusing them with its plasma membrane 14. Microscopic parasite which can infect living organisms and cause disease 17. Process by which a cell transports secretory products through the cytoplasm to the plasma membrane 21. The scientific process of transferring fluid between molecules