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BIO NMDCAT Ribonucleic acid (RNA)
nmdcat.online July 3, 2026

61. The processing of eukaryotic ribosomal RNA involves the chemical modification and cleavage of a large precursor molecule designated as

A. 45S pre-rRNA
✓
B. 30S pre-rRNA
C. 18S pre-rRNA
D. 28S pre-rRNA

📝 Explanation

In mammals and high eukaryotes, a single large 45S pre-rRNA transcript is synthesized and then cleaved to produce the 18S, 5.8S, and 28S rRNAs.

📖 Additional Information

  • 45S pre-rRNA
  • 30S pre-rRNA
  • 18S pre-rRNA
  • 28S pre-rRNA

In mammals and high eukaryotes, a single large 45S pre-rRNA transcript is synthesized and then cleaved to produce the 18S, 5.8S, and 28S rRNAs.

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