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Difficulty: HardBiotechnology and Nanotechnology

Consider the following statements regarding RNA Interference (RNAi) technology and nano-delivery systems in biotechnology:

1. RNA interference is a post-transcriptional gene silencing mechanism initiated by double-stranded RNA (dsRNA) molecules.
2. MicroRNAs (miRNAs) typically exhibit perfect sequence complementarity to a single specific target mRNA, leading to immediate enzymatic mRNA cleavage.
3. Lipid Nanoparticles (LNPs) act as delivery vehicles that protect delicate nucleic acids from degradation in extracellular fluids during systemic circulation.

Which of the statements given above is/are correct?

  1. A
    1 and 2 only
  2. 1 and 3 onlyAnswer
  3. C
    2 and 3 only
  4. D
    1, 2 and 3

Answer

1 and 3 only
The correct answer states that 1 and 3 only are correct. RNAi is indeed a post-transcriptional silencing process driven by dsRNA, and Lipid Nanoparticles (LNPs) serve as crucial nanoscale delivery carriers that encapsulate RNA molecules to prevent extracellular degradation. Statement 2 is false because miRNAs usually bind with partial complementarity to exert translational repression, whereas perfect complementarity and direct mRNA cleavage are characteristic of siRNAs.

Step-by-Step Solution

1
Evaluate Statement 1 regarding RNA interference mechanism
Statement 1 is correct.
RNA interference (RNAi) is a conserved biological pathway where double-stranded RNA (dsRNA) triggers sequence-specific gene silencing at the post-transcriptional level.
2
Evaluate Statement 2 regarding miRNA complementarity and cleavage mechanism
Statement 2 is incorrect.
Small interfering RNAs (siRNAs) generally require full, perfect complementary binding to target specific mRNA for direct cleavage. MicroRNAs (miRNAs), on the other hand, typically possess partial or imperfect sequence complementarity, allowing them to target multiple distinct mRNAs and suppress translation rather than causing direct cleavage.
3
Evaluate Statement 3 regarding Lipid Nanoparticles (LNPs) as therapeutic delivery vehicles
Statement 3 is correct.
Lipid Nanoparticles (LNPs) shield sensitive nucleic acid payloads (such as siRNA or mRNA) from rapid enzymatic degradation by ribonucleases in systemic circulation and facilitate cellular uptake.

Key Concept

RNA interference mechanisms and nanomedicine drug delivery systems
Estimated Time:2m 0s
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Topics

Biotechnology and Nanotechnology

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