The metabolism of cytidine-2-(14)C and uridine-2-(14)C was studied in discs cut from leaflets of bean plants (Phaseolus vulgaris L.). Cytidine was degraded to carbon dioxide and incorporated into RNA at about the same rates as was uridine. Both nucleosides were converted into the same soluble
Poly(A)-containing messenger RNA was purified from polyribosomes isolated from the primary leaves of 7-day-old dark-grown seedlings of Phaseolus vulgaris var. Masterpiece. Analysis of the messenger RNA on 2.4% polyacrylamide gels showed that it consists of a heterogeneous population of molecules