A multiprotem complex that incorporates one strand of a small interfering RNA (SIRNA) or microRNA (miRNA) is called

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HPSC Assistant Professor 2018 Botany (Official Paper)

Answer 1

The correct answer is RNA-induced silencing complex (RISC)

Explanation:

RNA-induced silencing complex (RISC) is a multiprotein complex that plays a crucial role in the RNA interference (RNAi) pathway.
RISC incorporates one strand of a small interfering RNA (siRNA) or microRNA (miRNA) and uses this strand to recognize complementary mRNA sequences.
Once the target mRNA is recognized, RISC can either degrade the mRNA or inhibit its translation, effectively silencing the gene expression.
This mechanism is essential for regulating gene expression and maintaining cellular function.

Other Options:

RNA-induced transcriptional silencing (RITS): RITS is another protein complex involved in RNAi, but it primarily functions in the nucleus to mediate transcriptional gene silencing by modifying chromatin structure.
Repeat associated silencing RNAs (ra-siRNAs): These are a class of small RNAs involved in the silencing of repetitive elements in the genome, often through mechanisms similar to those employed by RITS.
Short interfering RNAs (siRNAs): These are double-stranded RNA molecules, typically 20-25 base pairs in length, that play a role in the RNAi pathway by guiding RISC to complementary mRNA targets for degradation. However, siRNAs themselves are not the complex; they are the molecules that RISC incorporates.