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BIO NMDCAT Structure of DNA
nmdcat.online July 3, 2026

79. The molecular consequence of a mutation that introduces a stop codon near the beginning of a gene’s coding region is

A. The production of a completely normal protein product
B. The generation of a truncated, likely non-functional protein
✓
C. Accelerated transcription of the entire gene locus
D. Spontaneous duplication of the mutated chromosome

📝 Explanation

A premature stop codon halts translation early, yielding an incomplete, truncated polypeptide chain that is usually non-functional.

📖 Additional Information

  • The production of a completely normal protein product
  • The generation of a truncated, likely non-functional protein
  • Accelerated transcription of the entire gene locus
  • Spontaneous duplication of the mutated chromosome

A premature stop codon halts translation early, yielding an incomplete, truncated polypeptide chain that is usually non-functional.

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