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

96. A genetic mutation introduces a premature termination codon (PTC) into the middle of a gene’s second exon. The eukaryotic cell identifies this aberrant transcript using a surveillance pathway that targets the mRNA for degradation before translation, a process known as

A. RNA interference (RNAi)
B. Nonsense-mediated mRNA decay (NMD)
✓
C. Alternative splicing modulation
D. Epigenetic gene silencing

📝 Explanation

NMD is a surveillance mechanism that detects premature stop codons on transcripts and degrades them, preventing the accumulation of toxic, truncated proteins.

📖 Additional Information

  • RNA interference (RNAi)
  • Nonsense-mediated mRNA decay (NMD)
  • Alternative splicing modulation
  • Epigenetic gene silencing

NMD is a surveillance mechanism that detects premature stop codons on transcripts and degrades them, preventing the accumulation of toxic, truncated proteins.

🔗 Share This Question

Facebook Twitter LinkedIn WhatsApp

🧭 Navigate Questions

Previous Question

95. A researcher utilizes a chemical toxin that selectively prevents the hydrolysis of pyrophosphate (PPi​) during nucleic acid synthesis. The immediate impact of this drug on gene replication and transcription is the

Next Question

97. An analysis of the spatial orientation of the B-DNA double helix shows that the glycosidic bonds linking the bases to the sugar rings project at unequal angles. This structural asymmetry means that the phosphodiester backbones are

Back to All Questions

🔗 Related MCQs

An increase in the incidence of ectopic pregnancies within a population can often be epidemiologically correlated with a prior increase in the prevalence of which sexually transmitted disease?
July 16, 2026
In the life cycle of Herpes Simplex Virus 2 (HSV-2), the virus travels along nerve fibers to reach the sensory ganglia. The cellular mechanism responsible for this retrograde transport utilizes:
July 16, 2026
A defining characteristic of the lesions associated with the secondary stage of syphilis is that they:
July 16, 2026
The causative agent of genital herpes, HSV-2, is enveloped. The biological significance of this viral envelope in the context of transmission is that it makes the virus:
July 16, 2026
The structural basis for the severe cardiovascular complications seen in tertiary syphilis, such as aortic aneurysms, is the chronic inflammation and destruction of:
July 16, 2026

Categories

View all →