The idea of spontaneous generation was disproved by in an experiment involving jars of meat.

Explanation:

In 1668, Redi decided to try to disprove spontaneous generation, which was the thought the flies came from rotten meat and other animals came from nonliving things. He put two indentical pieces of meat in jars. He left one covered and the other uncovered. The uncovered meat teamed with flies, which the covered meat did not. Redi concluded that meat doesn't create flies, but rather the flies are attracted to the meat.

nucleic acid molecules are incredibly complex, containing the code that guarantees the four different nucleotide units comprise dna, the nucleic acid of interest to the genealogist. and one of four nitrogen-containing molecules called nucleotides