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Across
  1. 1. membranous tissue covering internal organs and other internal surfaces of the body
  2. 4. hormone that your brain produces in response to darkness
  3. 7. fine spores produced by flowers to fertilize other flowers
  4. 8. breaking down an organic substance, such as sugar into alcohol
  5. 10. substance that initiates or accelerates a chemical reaction
  6. 11. taxonomic group whose members can interbreed
  7. 17. the dark lady of DNA
  8. 18. any chemical reaction in which a molecule of water breaks one or more chemical bonds
  9. 19. any substance that stimulates an immune response in the body
  10. 24. any toxin that affects neural tissues
  11. 25. the cell from the union of a haploid spermatozoon and ovum
  12. 26. the period during which an embryo develops
  13. 27. the state of steady internal, physical, and chemical conditions maintained by living systems
  14. 28. the process of movement of molecules under a concentration gradient
  15. 29. the template for protein synthesis
  16. 30. a membrane-bound organelle containing digestive enzymes
Down
  1. 2. an individual animal or flower that has both male and female reproductive organs
  2. 3. the outer layer of skin covering the body's surface
  3. 5. injection of weakened or dead microbes to create antibodies
  4. 6. an animal organ in which gametes are produced, such as a testis or an ovary
  5. 9. the spread of cancer cells from the place where they first formed to another part of the body
  6. 12. the ancestry or lineage of an individual
  7. 13. part of DNA controlling physical characteristics and growth
  8. 14. any of the forms of a gene that can occupy the same locus
  9. 15. any of green pigments found in photosynthetic organisms
  10. 16. association between two different organisms wherein one benefits at the expense of the other
  11. 20. a specialized condensed region of each chromosome that appears during mitosis where the chromatids are held together to form an X shape
  12. 21. an immunological assay commonly used to measure antibodies, antigens, proteins and glycoproteins in biological samples
  13. 22. an association between two organisms in which one benefits and the other derives neither benefit nor harm
  14. 23. a branch of biology that studies the structure, function, and behavior of cells