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THE GENETIC BASIS OF LIFE 
Analogy
DEFINITIONS
DNA (deoxyribonucleic acid)- a double helix chain of sugar-phosphates (deoxyribo 
          sugar-phosphates) connected by nucleic acids (adenine, thymine, guanine, cytosine).
RNA (ribonucleic acid) - a single stranded chain of sugar-phosphates (ribo sugar-phosphates)
           containing nucleic acids (adenine, uracil, guanine, cytosine).
nucleic Acids - organic acids that form the base pairs of DNA and single-bases of  RNA.
  Base Pairing of Nucleic Acids between the double strands of  DNA
    A- T  (adenine-thymine)
    G - C (guanine-cytosine)
  Base Pairing of Nucleic Acids between DNA strands and RNA strands
    A - U  (adenine-uracil)
    G - C (guanine-cytosine)
gene - a length of DNA that codes for the production of a protein or protein subunit.
         - also codes for active RNAs (such as tRNA).
protein - a polymer or chain of amino acids.
enzyme - a protein that acts as a metabolic catalyst.