Biology CrossWord Puzzle

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Across
  1. 2. Relating to or resulting from living things, especially in their ecological relations.
  2. 4. An autotrophic organism that serves as a source of food for other organisms in a food chain.
  3. 6. Cell division that results in two daughter cells.
  4. 9. Occurs when a DNA gene is damaged or changed in such a way as to alter the genetic message carried by that gene.
  5. 10. A process of transferring fluid between molecules.
  6. 11. A nitrogen-containing molecule that has the same chemical properties as a base.
  7. 13. The practice of living as a parasite in or on another organism.
  8. 14. A compound consisting of a nucleoside linked to a phosphate group.
  9. 15. An association between two organisms in which one benefits and the other derives neither benefit nor harm.
  10. 19. Any of a class of organic compounds that are fatty acids or their derivatives and are insoluble in water but soluble in organic solvents.
  11. 21. Symbiosis that is beneficial to both organisms involved.
  12. 22. Capable of being permeated or passed through, used especially of substances where fluids can penetrate or pass through.
  13. 24. A compound which is one of the four constituent bases of nucleic acids. (It is paired with adenine in double-stranded DNA)
Down
  1. 1. Physical rather than biological; not derived from living organisms.
  2. 3. A threadlike structure of nucleic acids and protein found in the nucleus of most living cells.
  3. 5. The net passive movement of particles from a region in which they are in higher concentration to regions of lower concentration.
  4. 7. The process by which a double-stranded DNA molecule is copied to produce two identical DNA molecules.
  5. 8. A pair of parallel helices intertwined about a common axis, especially that in the structure of the DNA molecule.
  6. 12. A complex organic substance present in living cells. (Especially DNA or RNA)
  7. 15. A cycle of stages that cells pass through to allow them to divide and produce new cells.
  8. 16. The second stage of cell division, between Prophase and Anaphase.
  9. 17. A compound that occurs in guano and fish scales, and is one of the four constituent bases of nucleic acids.
  10. 18. An organism that generally obtains food by feeding on other organisms or organic matter due to lack of the ability to manufacture own food from inorganic sources.
  11. 20. A molecule composed of polymers of amino acids joined together by peptide bonds. It can be distinguished from fats and carbohydrates by containing nitrogen.
  12. 23. A compound which is one of the four constituent bases of nucleic acids. (It is paired with thymine in double-stranded DNA)