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