Biology 1201A Chapter 13: Chapter-13-Gene-Structure-and-Expression
5 Apr 2018
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13. 1 the connection between dna, rna, and protein. Although the relationship btwn proteins and nucleic acids was once uncertain, it"s now common knowledge that proteins are encoded by genes made of dna. 13. 1a genes specify either protein or rna products. In the 2nd piece of research, george beadle and edward tatum, working in the. 1940s with the orange bread mould neurospora crassa, collected data showing a direct relationship btwn genes and enzymes: beadle and tatum chose neurospora for their work b/c it"s a haploid fungus with simple nutritional needs. In sum, beadle and tatum had shown the direct relationship btwn genes and enzymes, which they put forward as the one-gene-one-enzyme hypothesis. It"s important to understand that protein structure and function are now known to be more complex than suggested by the work of beadle and tatum. Many proteins consist of more than 1 subunit.
