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

91. An analysis of a eukaryotic gene reveals that it produces a single pre-mRNA transcript, but three distinct tissue-specific proteins are detected. This structural variation is most likely achieved by

A. Variable polyadenylation at the 5' terminus
B. Post-transcriptional alternative splicing of exons
✓
C. Intramolecular rearrangement of the DNA promoter elements
D. Deamination of cytosine bases within the ribosomal RNA subunits

📝 Explanation

Alternative splicing allows exons to be skipped or combined in different ways, creating diverse protein products from one primary transcript.

📖 Additional Information

  • Variable polyadenylation at the 5' terminus
  • Post-transcriptional alternative splicing of exons
  • Intramolecular rearrangement of the DNA promoter elements
  • Deamination of cytosine bases within the ribosomal RNA subunits

Alternative splicing allows exons to be skipped or combined in different ways, creating diverse protein products from one primary transcript.

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90. A researcher synthesizes a structural variant of a tRNA molecule where the anticodon sequence is altered from 3'-UAC-5' to 3'-UUG-5', but the molecule remains charged with methionine. During translation, this engineered tRNA will insert methionine at codons reading

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