Biology: vocab words

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Across
  1. 5. he semipermeable membrane surrounding the cytoplasm of a cell.
  2. 7. a network of membranous tubules within the cytoplasm of a eukaryotic cell, continuous with the nuclear membrane.
  3. 9. a change or the process of change by which an organism or species becomes better suited to its environment.
  4. 11. 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
  5. 15. a minute cylindrical organelle near the nucleus in animal cells, occurring in pairs and involved in the development of spindle fibers in cell division.
  6. 16. simple organic compound containing both a carboxyl and an amino
  7. 18. a microscopic single-celled organism that has neither a distinct nucleus with a membrane nor other specialized organelles
  8. 21. an organelle found in large numbers in most cells, in which the biochemical processes of respiration and energy production occur.
  9. 22. a structure found inside cells that is involved in making proteins.
  10. 23. he hierarchy of complex biological systems and structures
  11. 27. The cell theory states that all biological organisms are composed of cells; cells are the unit of life and all life come from preexisting life
  12. 29. a molecule containing a very large number of atoms, such as a protein, nucleic acid, carbohydrates and lipids
  13. 30. any of a number of organized or specialized structures within a living cell.
Down
  1. 1. a plastid that contains chlorophyll and in which photosynthesis takes place.
  2. 2. food consisting of or containing a lot of sugars, starch, cellulose, or similar substances that can be broken down to release energy in the human body, and make up one of the main nutritional food groups.
  3. 3. he highest category in taxonomic classification.
  4. 4. a genetic structure in a cell that can replicate independently of the chromosomes
  5. 6. 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.
  6. 8. a rigid layer of polysaccharides lying outside the plasma membrane of the cells of plants, fungi, and bacteria
  7. 10. a dense organelle present in most eukaryotic cells, typically a single rounded structure bounded by a double membrane, containing the genetic material.
  8. 12. A molecule made up of amino acids.
  9. 13. an infective agent that typically consists of a nucleic acid molecule in a protein coat
  10. 14. A member of a large group of unicellular microorganisms which have cell walls but lack organelles and an organized nucleus
  11. 17. the system of nomenclature in which two terms are used to denote a species of living organism
  12. 19. the branch of science concerned with classification, especially of organisms.
  13. 20. a simple sugar which is an important energy source in living organisms and is a component of many carbohydrates.
  14. 24. a complex organic substance present in living cells, especially DNA or RNA, whose molecules consist of many nucleotides linked in a long chain.
  15. 25. a compound consisting of a nucleoside linked to a phosphate group. Nucleotides form the basic structural unit of nucleic acids such as DNA.
  16. 26. a branching diagram showing the cladistic relationship between a number of species.
  17. 28. a slender threadlike structure, especially a microscopic appendage that enables bacteria and others to swim.