biology

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Across
  1. 3. a compound which is one of the four constituent bases of nucleic acids
  2. 6. basic building block of nucleic acids
  3. 8. the basic physical unit of inheritance
  4. 11. of the structure of a DNA molecule
  5. 15. bond-an intermolecular force
  6. 16. a substance that is insoluble in water and soluble in alcohol, ether, and chloroform
  7. 17. organism that lacks a distinct nucleus and other organelles due to the absence of internal membranes
  8. 22. up of chemical 'building blocks' called amino acids
  9. 23. compound that occurs in guano and fish scales
  10. 24. the interatomic linkage that results from the sharing of an electron pair between two atoms
  11. 25. a sequence of three nucleotides which together form a unit of genetic code
Down
  1. 1. a single set of unpaired chromosomes
  2. 2. A form of phosphoric acid
  3. 4. to the body
  4. 5. mature haploid male or female germ cell
  5. 7. containing two complete sets of chromosomes-a threadlike structure of nucleic acids and protein found in the nucleus
  6. 9. acid- molecules that combine to form proteins
  7. 10. sugar derived from ribose
  8. 12. whose cells have a nucleus enclosed within a nuclear envelope
  9. 13. one of four chemical bases in DNA
  10. 14. a biological catalyst
  11. 18. simple sugar and carbohydrate
  12. 19. helix-description of the structure of a DNA molecule
  13. 20. is a nucleotide
  14. 21. minute particle consisting of RNA and associated proteins