Which of the Following Is Not a Commonly Used Technique

question 27

Multiple Choice

Which of the following is not a commonly used technique for protein isolation and purification?

• A) gas-liquid chromatography.
• B) ion exchange chromatography.
• C) electrophoresis.
• D) solubility ("salting in" and "salting out").
• E) affinity chromatography.

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Definitions:

Standard Cost

A predetermined cost for a product or service, based on expected material, labor, and overhead costs, used as a benchmark to control actual costs.

Materials Price Variance

The difference between the actual cost of materials used in production and the expected (or standard) cost, reflecting changes in material prices.

Materials Quantity Variance

The gap between the actual and expected quantities of materials used in production, with each difference multiplied by the standard unit cost.

Raw Materials Purchase

The acquisition of basic materials needed for the production of goods, a critical input in the manufacturing process.