siRNA stands for small interfering RNA.

siRNA stands for small interfering RNA.

• A. Small Initiating RNA
• B. Silencing RNA
• C. Small interfering RNA
• D. Small internal RNA

Answer: (C)

siRNA stands for small interfering RNA, a short double-stranded RNA molecule that triggers RNA interference to block gene expression. The “small” part refers to its typical length of about 21–25 nucleotides. The “interfering” part reflects its role in guiding the RNA-induced silencing complex to a target messenger RNA with a complementary sequence, causing the mRNA to be cleaved and degraded and thereby preventing its translation. This mechanism is a key way cells regulate genes and defend against foreign genetic material. The other options don’t match how this molecule is defined: they either describe something different or omit the established terminology, whereas the standard term used is “small interfering RNA.”

siRNA stands for small interfering RNA, a short double-stranded RNA molecule that triggers RNA interference to block gene expression. The “small” part refers to its typical length of about 21–25 nucleotides. The “interfering” part reflects its role in guiding the RNA-induced silencing complex to a target messenger RNA with a complementary sequence, causing the mRNA to be cleaved and degraded and thereby preventing its translation. This mechanism is a key way cells regulate genes and defend against foreign genetic material. The other options don’t match how this molecule is defined: they either describe something different or omit the established terminology, whereas the standard term used is “small interfering RNA.”