Final answer:
RNA transcripts are copies of DNA sequences, with valid sequences containing A, U, G, and C nucleotides. Among the options provided, CATUGUG is not a valid RNA transcript.
Explanation:
Ribonucleic acid (RNA) transcripts are produced during transcription, representing a copy of the DNA sequence. Among the options given, CATUGUG is not a valid RNA transcript because it contains characters other than A, U, G, and C typically found in RNA sequences.
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