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GRE Subject Question - Purification of a Protein

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Biochemists generally like to study and characterize proteins as pure substances isolated from their native enviroment. What is the single most important method or procedure that must be availible prior to starting the purification of a protein?

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The answer is given in an approximate 100 word explanation with a PowerPoint for protein purification attached for reference.

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Prior to purification, the biochemist must ensure that he has a "good source". A good source is one that is cheap and is readily available. An example is hemoglobin. Once he has a ...

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