46. Though DNA and RNA are nucleic acids, isolating RNA in the laboratory requires extreme
precautions and pre-preparations than isolating DNA. This could be because:
(a) RNA is more prone to hydrolysis than DNA,
(b) RNA is smaller in size than DNA,
(c) RNA molecules tend to form RNA-RNA hybrids,
(d) There is lesser RNA content per cell than DNA

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Why Does RNA Isolation Require More Precautions Than DNA?

While both DNA and RNA are vital nucleic acids for cellular function, RNA isolation in the laboratory is more challenging and requires greater precautions than DNA isolation. The fundamental reason lies in the inherent chemical instability and structural differences between RNA and DNA.

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RNA’s Susceptibility to Hydrolysis

The main reason RNA isolation requires more care is that RNA is more prone to hydrolysis than DNA. This is due to the following factors:

• RNA contains ribose, which has a hydroxyl group (-OH) at the 2′ position, making it highly reactive. This leads to spontaneous hydrolysis, breaking the phosphodiester bonds between nucleotides and causing degradation.

• In contrast, DNA contains deoxyribose, which lacks the 2′-hydroxyl group, making it more chemically stable and less susceptible to hydrolysis.

Thus, when isolating RNA, researchers must use RNase inhibitors, perform the process in cold environments, and handle samples with extra care to prevent degradation.

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Why Other Options Are Less Relevant

• (b) RNA is smaller in size than DNA

•  The size difference between RNA and DNA does not significantly impact the difficulty of isolation. The chemical stability of RNA plays a far greater role in the challenges of RNA isolation.

• (c) RNA molecules tend to form RNA-RNA hybrids
  While RNA can form RNA-RNA hybrids, this characteristic does not explain the need for increased precautions during isolation. The major challenge remains RNA’s chemical instability rather than its ability to form hybrids.

• (d) There is lesser RNA content per cell than DNA
   Although there is generally less RNA than DNA in a cell, this is not a direct factor in the difficulty of RNA isolation. The issue lies with the fragility and degradability of RNA, not its cellular abundance.

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Conclusion

The main reason RNA isolation requires more precautions than DNA isolation is that RNA is more prone to hydrolysis. Its unstable ribose backbone makes it more susceptible to degradation, requiring special handling techniques to preserve RNA integrity. Understanding these challenges is essential for researchers working with RNA in gene expression studies, RNA sequencing, and other molecular biology applications.