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

25. The presence of a poly-A tail at the 3′ end of a eukaryotic mRNA molecule functions to

A. Direct the ribosome to the start codon
B. Promote splicing of the final intron
C. Enhance stability and resist cytoplasmic degradation
✓
D. Initiate transcription termination

📝 Explanation

The poly-A tail protects mRNA from 3' exonucleases, extending its operational lifespan within the cytoplasm.

📖 Additional Information

  • Direct the ribosome to the start codon
  • Promote splicing of the final intron
  • Enhance stability and resist cytoplasmic degradation
  • Initiate transcription termination

The poly-A tail protects mRNA from 3' exonucleases, extending its operational lifespan within the cytoplasm.

🔗 Share This Question

Facebook Twitter LinkedIn WhatsApp

🧭 Navigate Questions

Previous Question

24. An increase in the concentration of cytoplasmic aminoacyl-tRNA synthetase directly influences the

Next Question

26. In prokaryotes, translation of an mRNA molecule can begin before transcription is complete due to the

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 →