Answer
Gene Expression Regulation: MicroRNAs (miRNAs) are small, non-coding RNA molecules that play a crucial role in regulating gene expression. They bind to the 3' untranslated region (UTR) of target mRNAs, leading to mRNA degradation or translational inhibition. This process allows miRNAs to fine-tune the expression of specific genes, influencing various cellular processes such as development, differentiation, and metabolism.