Compositions (reporter systems), which contain a ribozyme-encoding DNA sequence and an oligonucleotide substrate that is cleaved by the ribozyme transcribed by the DNA sequence, are described. In a preferred embodiment, the oligonucleotide substrate is labeled by a fluorophore group (reporter group) and a fluorescence-quenching group (quencher group), the fluorescence of the fluorophore being prevented from being quenched by the fluorescence-quenching group after cleavage by the ribozyme has taken place, and therefore a fluorescence signal is generated. Moreover, methods for measuring transcription rates, for instance for determining transcription-inhibitors or transcription activators, are described.
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