Dissolution of hypotheses in biochemistry: three case studies.
The history of biochemistry and molecular biology is replete with examples of erroneous theories that persisted for considerable lengths of time before they were rejected. This paper examines patterns of dissolution of three such erroneous hypotheses: The idea that nucleic acids are tetrads of the four nucleobases ('the tetranucleotide hypothesis'); the notion that proteins are collinear with their encoding genes in all branches of life; and the hypothesis that proteins are synthesized by reverse action of proteolytic enzymes. Analysis of these cases indicates that amassed contradictory empirical findings did not prompt critical experimental testing of the prevailing theories nor did they elicit alternative hypotheses. Rather, the incorrect models collapsed when experiments that were not purposely designed to test their validity exposed new facts.
Department of Biochemistry, Rappaport Faculty of Medicine, Technion - Israel Institute of Technology, POB 9649, 31096, Haifa, Israel. mickey@tx.technion.ac.il.
Michael
http://orcid.org/0000-0002-0893-5674
M
Fry
D001671:Biochemistry / Q000266:history*; D049673:History, 20th Century; D009696:Nucleic Acids / Q000235:genetics*; D011506:Proteins / Q000235:genetics*
D009696:Nucleic Acids; D011506:Proteins
Experimental refutation of biochemical hypotheses; Gene-protein collinearity; Hypotheses in biochemistry; Protease-catalyzed protein synthesis; Tetranucleotide hypothesis