The formation from simpler components of pyrimidine ribonucleoside triphosphate, a glycosamine consisting of a pyrimidine base linked to a ribose sugar esterified with triphosphate on its glycose moiety.

DNA replication, synthesis of RNA primer

The generation, by DNA polymerase alpha, of an RNA primer followed by a short segment of DNA on the lagging strand of the replicating DNA.

Catalysis of the hydrolysis of ester linkages within ribonucleic acid by creating internal breaks.

Catalysis of the endonucleolytic cleavage of RNA to 3'-phosphomononucleotides and 3'-phosphooligonucleotides ending in C-P or U-P with 2',3'-cyclic phosphate intermediates.

Catalysis of the endonucleolytic cleavage of RNA in RNA-DNA hybrids to 5'-phosphomonoesters.

The directed movement of L-proline, the levorotatory isomer of pyrrolidine-2-carboxylic acid, into, out of, within or between cells.

The directed movement of L-serine, the levorotatory isomer of 2-amino-3-hydroxypropanoic acid, into, out of, within or between cells.

Catalysis of the endonucleolytic cleavage of RNA to 5'-phosphomonoesters; cleaves multimeric tRNA precursor at the spacer region; also involved in processing of precursor rRNA, hnRNA and early T7-mRNA; also cleaves double-stranded DNA.

Catalysis of the endonucleolytic cleavage of RNA, removing 5' extra nucleotides from tRNA precursor.

Catalysis of the hydrolysis of ester linkages within nucleic acids by removing nucleotide residues from the 3' or 5' end.

Catalysis of the sequential hydrolytic removal of 5'-nucleotides from the 3'-hydroxy termini of 3'-hydroxy-terminated oligonucleotides.

Catalysis of the sequential cleavage of mononucleotides from a free 5' or 3' terminus of a DNA molecule.

The breakdown into simpler components of UDP, uridine (5'-)diphosphate.

The directed movement of L-aspartate, the levorotatory isomer of the anion of aspartic acid, into, out of, within or between cells.

Catalysis of the reaction: L-tryptophan + tetrahydropteridine + O2 = 5-hydroxy-L-tryptophan + dihydrobiopterin + H2O.