Abstract:449DNA from the yeast Kluyveromyces marxianus was studied for its heterogeneity and the multiplicity of rRNA cistrons. These cistrons banded at a slightly different density from the bulk DNA in preparative CsCl or Hg2+-CszSOa equilibrium density gradients. The reassociation kinetics of the bulk DNA showed that the repetitive fraction represented a small amount of the total cellular DNA (10%) and that the single copy fraction had a complexity of 6.3 x lo9 daltons. Approximately 2.2% of the DNA hybridized to 3H-… Show more
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