Abstract
The order of the different segments of the 42-S ribosomal precursor RNA of yeast was investigated. For that purpose first the lengths of the rRNA stretches were measured. These were inferred from the relative amounts of oligonucleotides present in complete pancreatic ribonuclease digests of the two large rRNA components, and in this way were found to be 1600 and 3200 nucleotides, respectively. Next the influence of ultraviolet irradiation on the synthesis of both rRNA components in yeast cells was determined. It was found that the synthesis of 26-S rRNA is about 1.65 times more sensitive to ultraviolet damage of the DNA than the synthesis of 17-S rRNA. On the basis of these data the construction of the 42-S ribosomal precursor RNA was derived.
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