BIO NMDCAT Ribonucleic acid (RNA)

nmdcat.online July 3, 2026

74. The presence of a localized stem-loop (hairpin) structure followed by a string of uracil residues in a bacterial RNA transcript causes

A. Splicing of adjacent coding sequences

B. Rho-independent transcription termination

✓

C. Recruitment of the small ribosomal subunit

D. Addition of a 7-methylguanosine cap

📝 Explanation

The physical stress of the hairpin combined with the weak hydrogen bonds of the U-rich stretch forces the transcript to detach from the DNA template.

📖 Additional Information

Splicing of adjacent coding sequences
Rho-independent transcription termination
Recruitment of the small ribosomal subunit
Addition of a 7-methylguanosine cap

The physical stress of the hairpin combined with the weak hydrogen bonds of the U-rich stretch forces the transcript to detach from the DNA template.

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