Abstract
The diversity, abundance, and DNA sequence representation of poly(adenylic acid) containing RNA derived from cells of Achlya ambisexualis cultured in defined and undefined media have been determined. The kinetics of hybridization of polyadenylated RNA with complementary DNA were the same for both culture conditions and revealed the presence of three frequency classes containing 29, 220, and 3000 different sequences of an average length of 1150 nucleotides. Complexity estimates derived from experiments in which polyadenylated RNA was hybridized to unique sequence DNA were in good agreement with these results. The kinetics of hybridization of complementary DNA with an excess of nuclear DNA indicate that approximately 10% of the RNA is transcribed from reiterated DNA sequences while the remainder is transcribed from single copy sequences.
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