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DNA

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Issue:

Science

 

Written by:

Michael S

 

Date added:

August 12, 2013

 

Level:

University

 

Grade:

A

 

No of pages / words:

6 / 1405

 

Was viewed:

6196 times

 

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Essay content:

More than 50 years after the science of genetics was established and the patterns of inheritance were clarified, the largest questions remained unanswered: How are the chromosomes and their genes copied exactly from cell to cell, and how do they direct the structure and behavior of living things? Two American geneticists, George Wells Beadle and Edward Lawrie Tatum, provided one of the first important clues in the early 1940s...
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Working with the fungi Neurospora and Penicillium, they found that "genes direct the formation of enzymes through the units of which they are composed." (Annas) Each unit, a polypeptide is produced by a specific gene. This establish the field of molecular genetics. The fact that chromosomes were almost entirely composed of two kinds of chemical substances, protein and nucleic acids, had long been known...
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