Biology

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Across
  1. 2. are short sequences of DNA nucleotides
  2. 6. a compound that occurs in guano and fish scales, and is one of the four constituent bases of nucleic acids. A purine derivative, it is paired with cytosine in double-stranded DNA.
  3. 7. a molecule that contains genetic information for the development and functioning of an organism
  4. 10. a compound which is one of the four constituent bases of nucleic acids. A purine derivative, it is paired with thymine in double-stranded DNA.
  5. 11. enzymes that are capable of catalyzing the reaction of joining two large molecules by establishing a new chemical bond
  6. 12. a compound which is one of the four constituent bases of nucleic acids. A pyrimidine derivative, it is paired with adenine in double-stranded DNA.
  7. 14. a weak bond between two molecules resulting from an electrostatic attraction between a proton in one molecule and an electronegative atom in the other.
  8. 15. denoting replication of a nucleic acid in which one complete strand of each double helix is directly derived from the parent molecule.
Down
  1. 1. a compound found in living tissue as a constituent base of nucleic acids. It is paired with guanine in double-stranded DNA.
  2. 3. two strands run in opposite directions, but are parallel to each other
  3. 4. are enzymes that create DNA molecules by assembling nucleotides, the building blocks of DNA.
  4. 5. One of two types of nucleic acid made by cells.
  5. 8. is an enzyme that synthesizes short RNA sequences called primers
  6. 9. an enzyme that separates double-stranded DNA or RNA into single strands.
  7. 13. a compound consisting of a nucleoside linked to a phosphate group. Nucleotides form the basic structural unit of nucleic acids such as DNA.