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Biology

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Across
  1. 4. origin of new species due to the evolutinary process of descent with modification p272
  2. 5. type of archaea that lives in oxygen-free habitats, such as swamps, and releases methan gas p325
  3. 7. phase of cellualar respiration that requiers oxygen p323
  4. 8. exchange of DNA between bacteria by means of a bacteriophage p322
  5. 11. individual who studies fossils and the history of life p255
  6. 15. having a chromosome number that is a multiple greater than twice that of the monoploid number p162
  7. 16. type of archea that lives in extremely saly habitats p325
  8. 17. large-scale evolutionary change, such as the formation of new species p272
  9. 20. photosythetic bacterium that contains chlorophyll and releases oxygen; formerly called a blue-green algae p324
  10. 21. ancient layer of sedimentary rock; results from slow deposition of silt, volcanic ash, and other materials p251
  11. 22. sharing of genes between two populations through interbreeding p261
  12. 24. protein coat or shell that surrounds a viriion's nucleic acid p310
  13. 26. bacteria reproduction into two daughter cells without the utilization of a mitotic spindle p321
  14. 27. in biological evolution, a possible cell forerunner that became a cell once it could reproduce p318
  15. 28. total of all the genes of all the individuals in a population p260
Down
  1. 1. change in gene frequencies between populations of a species over time p259
  2. 2. alteration in chromosome structure or number and also an alteration in a gene due to a change in DNA composition p261
  3. 3. polyploid organism that contains the genomes of two or more different speices p279
  4. 6. cyanobacterial cell that sythesizes a nitrogen-fixing enzyme when nitrogen supplies dwindle p324
  5. 8. taking up of extraneous genetic amterial from the environment by bacteria p318
  6. 9. virus that infects bacteria p311
  7. 10. study of fossils that results in knowledge about the history of life p250
  8. 12. change in the genetic structure of populations due to selective breeding by humans p252
  9. 13. viral DNA that has been integrated into host cell DNA p315
  10. 14. study of geographical distribution of organisms p258
  11. 18. polyploid organism that contains a duplicated genome of the same species p279
  12. 19. RNA virus containing the ezyme reverse transcriptase that carries out RNA to DNA transcription p315
  13. 23. one of the 3 domains of life; contains prokaryotic cells that often live in extreme habitats and have unique genetic, biochemical, and physiological characteristics p297
  14. 25. spore formed within a cell p321
  15. 29. self-replicating ring of accessory DNA in the cytoplasm of bacteria p322