How does RNA interference (RNAi) function?

How does RNA interference (RNAi) function?

• A. By introducing foreign DNA into a cell
• B. By allowing cells to produce their own siRNA
• C. By blocking protein synthesis entirely
• D. By enhancing the expression of all genes

Answer: (B)

RNA interference (RNAi) is a biological process through which small RNA molecules, such as small interfering RNAs (siRNAs), can regulate gene expression. The correct answer highlights that RNAi functions by enabling cells to produce their own siRNA. These siRNAs are derived from longer double-stranded RNA molecules that are processed by the enzyme Dicer. Once generated, siRNAs are incorporated into the RNA-induced silencing complex (RISC), where they guide the complex to complementary mRNA targets. When siRNAs bind to their target mRNAs, they can lead to the degradation of the mRNA or inhibit its translation into proteins. This targeted approach allows for precise regulation of gene expression, allowing the cell to "silence" specific genes without affecting the expression of all genes indiscriminately. This capability is particularly valuable in research and therapeutic settings for studying gene function and developing treatments for diseases caused by gene overexpression or dysfunction. The other options presented do not accurately capture the mechanism of RNAi. Introducing foreign DNA into a cell is related to transfection and genetic manipulation, while blocking protein synthesis entirely does not occur as RNAi selectively targets specific mRNAs. Enhancing the expression of all genes does not align with the function of RNAi, which is

RNA interference (RNAi) is a biological process through which small RNA molecules, such as small interfering RNAs (siRNAs), can regulate gene expression. The correct answer highlights that RNAi functions by enabling cells to produce their own siRNA. These siRNAs are derived from longer double-stranded RNA molecules that are processed by the enzyme Dicer. Once generated, siRNAs are incorporated into the RNA-induced silencing complex (RISC), where they guide the complex to complementary mRNA targets.

When siRNAs bind to their target mRNAs, they can lead to the degradation of the mRNA or inhibit its translation into proteins. This targeted approach allows for precise regulation of gene expression, allowing the cell to "silence" specific genes without affecting the expression of all genes indiscriminately. This capability is particularly valuable in research and therapeutic settings for studying gene function and developing treatments for diseases caused by gene overexpression or dysfunction.

The other options presented do not accurately capture the mechanism of RNAi. Introducing foreign DNA into a cell is related to transfection and genetic manipulation, while blocking protein synthesis entirely does not occur as RNAi selectively targets specific mRNAs. Enhancing the expression of all genes does not align with the function of RNAi, which is