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