One reason why rna molecules are the leading candidate as the first informational molecule is that rna molecules are usually double stranded. rna nucleotides are a major component of cell membranes. rna serves as the hereditary material in today's prokaryotic cells. some rna molecules can function as enzymes.

Based on the observation that only male crickets produce a song, you hypothesize that a male's song is a form of communication to potential mates. you set up a simple experiment to test this hypothesis. in the laboratory, you place a male snowy tree cricket in enclosure a, which is adjacent to enclosureb. in enclosure b, you place other insects, one at a time, and observe their responses to the male's song. the enclosures are designed so that the two insects being tested cannot see or smell each other, but sound is transmitted from enclosure a to enclosureb.