Biology crossword

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Across
  1. 6. The constant struggle of a cell to keep its internal conditions balanced and stable
  2. 7. The mechanism of evolution where the most fit organisms survive and reproduce
  3. 10. The site of photosynthesis where light energy is converted into chemical energy
  4. 13. A medicine used to kill bacterial infections but is ineffective against viruses
  5. 15. A biological catalyst that lowers activation energy to speed up reactions
  6. 17. A structure that has lost its original function through evolution
  7. 19. An organism that can make its own food.
  8. 20. Each step in the energy pyramid
  9. 21. A beneficial trait that helps an organism survive in its specific environment
  10. 24. The monomer of nucleic acids made of a sugar, phosphate, and nitrogen base
  11. 28. Any change in the DNA sequence that can be helpful, harmful, or neutral
  12. 29. A condition in which both alleles for a gene are fully and separately expressed
  13. 31. Body systems responsible for fighting off infections
  14. 35. The genetic combination of alleles represented by letters like Aa or bb
  15. 38. Cell division that creates four genetically different haploid gametes
  16. 39. An association between two organisms in which one benefits and the other derives neither benefit nor harm.
  17. 40. The formation of a new and distinct species over the course of evolution
Down
  1. 1. A macromolecule composed of monosaccharides used for quick energy
  2. 2. The stage of the cell cycle where the nucleus divides into two identical nuclei
  3. 3. Factors in an ecosystem that are not alive
  4. 4. The organelle where glucose is broken down to create ATP energy
  5. 5. A simple, single-celled organism that lacks a nucleus
  6. 8. The movement of materials across a membrane that requires the cell to use energy
  7. 9. The single cell that is formed when a sperm and egg unite during fertilization
  8. 11. consumer that feeds directly on producers
  9. 12. Any type of harmful agent that can cause illness (virus or bacteria)
  10. 14. A genetic situation where the phenotype is a blend
  11. 16. The process occurring in the nucleus where DNA is used to make mRNA
  12. 18. An organism that makes its own food
  13. 22. The process at the ribosome where mRNA is read to build a protein
  14. 23. Organism that obtains energy from the foods it consumes; also called a consumer
  15. 25. A viral replication cycle in which copies of a virus are made within a host cell, which then bursts open, releasing new viruses
  16. 26. A close relationship between two species that benefits at least one of the species.
  17. 27. The specific term for water diffusing across a semi-permeable membrane
  18. 30. Having two different versions of an allele for a specific gene
  19. 32. A symbiotic relationship in which both species benefit from the relationship
  20. 33. A hydrophobic molecule used for long-term energy storage and insulation
  21. 34. An organism like a fungus that breaks down dead matter and returns nutrients to the soil
  22. 36. The physical expression of a trait that you can actually observe with your eyes
  23. 37. Nonliving, requires a host to replicate, move and survive