Period 4 review for final

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Across
  1. 3. site: is where the chemical reaction occurs (two words)
  2. 4. – positive charge bound to the nucleus along with neutrons
  3. 5. – the portion of the cell outside the nucleus
  4. 10. – oldest cells
  5. 13. reproduction – the fusion of two separate parents cells to produce offspring with some genetic information from each parent (two words)
  6. 14. – small, swimming animals that feed off algae
  7. 16. an inherited trait that increases an organism’s chances of survival
  8. 18. – atoms of the same element that have different numbers of neutrons
  9. 19. energy: the energy required to start a chemical reaction (two words)
  10. 20. cell = more demand on it’s DNA (two words)
  11. 21. – “little organs” each have specialized function like organs
  12. 22. Selection: Organisms that are best adapted to an environment survive and reproduce more than others (two words)
  13. 25. a record of the history of life on Earth
Down
  1. 1. Descent – all living organisms are related to one another (two words)
  2. 2. – no charge bound to nucleus
  3. 6. : the molecule that the enzyme acts on.
  4. 7. – genetic information bundled into packages of DNA
  5. 8. Chromosomes: Single, circular chromosome in the cytoplasm (two words)
  6. 9. cycle – process of cell growth and division (two words)
  7. 11. – negative charge, are in constant motion in the space surrounding the nucleus
  8. 12. newer cells
  9. 15. Organs: “leftover” traces of evolution that serve no purpose (two words)
  10. 17. : are inorganic molecules that speed up chemical reactions
  11. 23. web- network of feeding interaction (two words)
  12. 24. reproduction – production of genetically identical offspring from a single parent (two words)