Which type of RNA molecule plays a crucial role in the regulation of gene expression by binding to specific messenger RNA molecules and preventing their translation?

A MicroRNA ✓
B Transfer RNA
C Ribosomal RNA
D Small nuclear RNA

Explanation

MicroRNAs (miRNAs) are small non-coding RNAs that regulate gene expression by binding to complementary sequences on target messenger RNA (mRNA) molecules, leading to their degradation or repression of translation.

Source

Lodish et al., Molecular Cell Biology
Fundamentals of Biochemistry Molecular Biology Gene Regulation Medium MEDICAL Confidence: high