How does complementary base pairing within a single RNA molecule determine its structure and function?

Complementary base pairing within a single RNA molecule helps determine its structure and function by forming specific hydrogen bonds between adenine (A) and uracil (U), and between guanine (G) and cytosine (C). This pairing creates a stable double-stranded structure, allowing the RNA molecule to fold into specific shapes and interact with other molecules, such as proteins, to carry out its biological functions.