📚 Learning Guide
Protein Denaturation
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A researcher is preparing a sample of bovine serum albumin (BSA) for a protein quantification assay. During the preparation, they accidentally expose the sample to high temperatures and strong agitation. What is the most likely consequence of these conditions on the BSA sample, and how should the researcher proceed to ensure accurate results?

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Choose the Best Answer

A

The BSA will denature, resulting in inaccurate quantification; the researcher should cool the sample and minimize agitation.

B

The BSA will remain stable, ensuring accurate quantification; no changes are needed.

C

The BSA will denature, but it will not affect the quantification method; standard procedures will suffice.

D

The BSA will denature, but the researcher can compensate for this by adjusting the assay conditions.

Understanding the Answer

Let's break down why this is correct

Answer

High temperatures and vigorous shaking will cause the BSA to unfold and aggregate, destroying its native structure and exposing hydrophobic patches that stick together. This denatured protein no longer behaves the same in a quantification assay, so the measured absorbance or color change will be inaccurate. The researcher should discard the damaged aliquot and prepare a fresh, properly stored sample, keeping it on ice and mixing gently. If the protein must be reused, the researcher could try to refold it by slowly cooling it and adding a suitable buffer, but the safest approach is to start over with a new, properly handled BSA stock. This ensures the assay reflects the true protein concentration.

Detailed Explanation

Heat and vigorous shaking break the weak bonds that keep BSA folded. Other options are incorrect because The idea that proteins never change is wrong; Denaturation does affect how the protein reacts in an assay.

Key Concepts

Protein Denaturation
Protein Stability
Quantification Methods
Topic

Protein Denaturation

Difficulty

medium level question

Cognitive Level

understand

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