During RNA interference, what binds to an mRNA to inhibit...

During RNA interference, what binds to an mRNA to inhibit translation?
a. a pri-miRNA
b. a pre-miRNA or pre-siRNA
c. a double-stranded miRNA or double-stranded siRNA
d. a single-stranded miRNA or single-stranded siRNA
e. dicer

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Key Concepts

RNA Interference

RNA interference (RNAi) is a biological process where RNA molecules inhibit gene expression by neutralizing targeted mRNA molecules. This mechanism is critical for regulating gene expression and defending cells against viral genomes or transposons.

MicroRNAs and Small Interfering RNAs

MicroRNAs (miRNAs) and small interfering RNAs (siRNAs) are short, non-coding RNAs that guide the RNA-induced silencing complex (RISC) to complementary mRNA sequences. Once bound, they mediate either mRNA degradation or hinder the translation process, thereby controlling protein synthesis.

mRNA Binding

mRNA serves as the carrier of genetic information from DNA to the ribosomes during protein synthesis. The binding of small RNA molecules to mRNA is fundamental in the RNA interference pathway, as it determines which mRNAs are targeted for translational inhibition or degradation.

Translational Inhibition Mechanism

Translational inhibition involves preventing mRNA from being translated into protein. In RNA interference, the guide strand of a miRNA or siRNA loads into the RISC, which then binds to a complementary mRNA, blocking the translation machinery and thereby reducing the production of the corresponding protein.

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