Levels of the ribonucleoside triphosphates and rate of RNA synthesis in Neurospora crassa.

The levels of the four ribonucleoside triphosphate (ATP, GTP, UTP and CTP) have been determined in Neurospora crassa in three conditions of exponential growth (on glucose, acetate and glycerol) as well as in the course of a shift-up and a shift-down transition of growth between two of them. Although in some cases the pools appear proportional to the rate of synthesis of ribosomal RNA, this seems not to be strictly dependent on the level of the nucleotides.