Abstract
High redundancy of rRNA cistrons inAcetabularia has been postulated from an estimation based on the rate of synthesis and on the long half life of rRNA in this organism. This hypothesis was proved inAcetabularia major by means of Miller's spreading technique. The rRNA cistrons in this giant single cell alga have been shown to be highly redundant. The redundancy seems to be correlated to the length of the cell indicating that the amplification takes place during at least the greater part of the vegetative phase. Up to 52 cistrons have been detected on one DNA matrix. The length of the rRNA cistron corresponds quite closely to what would be expected for a DNA coding for RNA of the molecular weight 2.1×106 daltons. This value indicates that there is little if any loss of nucleotide material during the maturation of the 18 S and 26.5 S rRNAs inAcetabularia.
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