Lecture 30 Questions

Lecture 30 Questions - 1. Beadle and Tatum used Neurospora...

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1. Beadle and Tatum used Neurospora crassa. They studied mutants and the relationship between genes and enzymes. They obtained them by blasting samples with x-rays and isolating the mutagenized specimens. 2. How has our present concept of a gene and its specific product been refined since Beadle and Tatum? Beadle and Tatum had a 1 gene – 1 enzyme theory. Later research showed that all enzymes are proteins, but not all proteins are enzymes. Thus, the theory was changed to one enzyme – one protein. However, mutations can change a subunit of a protein, even if only one amino acid is changed. The conclusion is 1 gene – 1 polypeptide. 3. Why is the genetic code referred to as a triplet code? What is a codon? Why do we say the code is specific but redundant? What does the codon AUG code for? Why do we describe the genetic code as “universal”? How does the tobacco plant transformed with firefly luciferase illustrate your answer? The triplet code means that instructions for a polypeptide chain are written in DNA as a series of
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This note was uploaded on 03/09/2010 for the course BIOL 1201 taught by Professor Wishtichusen during the Spring '07 term at LSU.

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Lecture 30 Questions - 1. Beadle and Tatum used Neurospora...

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