Answer:
The miRNA sequence is complementary to the mRNA sequence so they base pair.
Explanation:
miRNA or microRNA is is a small non-coding RNA molecule that is involved in RNA silencing and post-transcriptional regulation of gene expression. mi RNA performs its function by base-pairing with complementary sequences in mRNA.
As a result of complementary binding between miRNA and mRNA the gene can be silenced by: mRNA cleavage or by destabilization of the mRNA by shortening of its poly(A) tail.