Biology

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Across
  1. 3. biological community of interacting organisms and their physical environment.
  2. 5. a group of organisms living in the same place or having a particular characteristic in common.
  3. 11. the basic unit of a chemical element.
  4. 12. all the inhabitants of a particular town, area, or country.
  5. 15. the systematic organization of organisms into levels.
  6. 16. the intermingling of substances by the natural movement of their particles.
  7. 17. part of an organism that is typically self-contained and has a specific vital function such as the heart or liver in humans.
  8. 18. the tendency toward a relatively stable equilibrium between interdependent elements, especially as maintained by physiological processes.
  9. 19. a class of nitrogenous organic compounds that have large molecules composed of one or more long chains of amino acids and are an essential part of all living organisms, especially as structural components of body tissues such as muscle, hair, etc., and as enzymes and antibodies.
  10. 20. the regions of the surface atmosphere and hydrosphere of the earth (or analogous parts of other planets) occupied by living organisms.
  11. 23. an organism consisting of a cell or cells in which the genetic material is DNA in the form of chromosomes contained within a distinct nucleus eukaryotes include all living organisms other than the eubacteria and archaebacteria.
  12. 26. a microscopic single-celled organism that has neither a distinct nucleus with a membrane nor other specialized organelles. Prokaryotes include the bacteria and cyanobacteria.
  13. 29. a molecule containing a very large number of atoms such as a protein nucleic acid or synthetic polymer.
  14. 30. function of the output of a system, process, or mechanism is fed back in a manner that tends to reduce the fluctuations in the output.
  15. 31. any of a class of organic compounds that are fatty acids or their derivatives and are insoluble in water but soluble in organic solvents. They include many natural oils, waxes, and steroids.
Down
  1. 1. a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.
  2. 2. set of things working together as parts of a mechanism or an interconnecting network.
  3. 4. molecules that combine to form proteins.
  4. 6. a complex organic substance present in living cells, especially DNA or RNA, whose molecules consist of many nucleotides linked in a long chain.
  5. 7. solution that has a high solute concentration and low water concentration compared to body fluids.
  6. 8. the distinct types of material of which animals or plants are made, consisting of specialized cells and their products.
  7. 9. a large group of organic compounds that includes sugars starch and cellulose containing hydrogen and oxygen in the same ratio as water (2:1) and used as structural materials and for energy storage within living tissues.
  8. 10. any external solution that has the same solute concentration and water concentration compared to body fluids.
  9. 13. a process that occurs in a feedback loop which exacerbates the effects of a small disturbance.
  10. 14. carbon atoms are the basis of most molecules that make up living things.
  11. 21. the net movement of water across a semipermeable membrane
  12. 22. class of organic chemical compounds composed only of the elements carbon (C) and hydrogen (H).
  13. 24. individual animal, plant, or single-celled life form.
  14. 25. the smallest structural and functional unit of an organism.
  15. 27. number of organized or specialized structures within a living cell.
  16. 28. solution containing a lower amount of solute in comparison to the solute concentration in other solutions across a semipermeable membrane.