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Aim

Theory

Pretest

Procedure

Simulation

Posttest

References

Feedback

Study of some processing changes in proteins

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1. At which pH value was the solubility of the protein powder lowest?

a: pH 3.0 Explanation

Explanation

b: pH 4.0 Explanation

Explanation

c: pH 4.5 Explanation

Explanation

d: pH 6.0 Explanation

Explanation

2. Which of the following best describes the insoluble matter (IM) in the experiment?

a: Soluble proteins Explanation

Explanation

b: Precipitated proteins Explanation

Explanation

c: Buffer solution Explanation

Explanation

d: Filter paper residue Explanation

Explanation

3. What is the significance of the solubility curve obtained in the experiment?

a: It shows the optimal pH for protein extraction Explanation

Explanation

b: It identifies the temperature range for protein solubility Explanation

Explanation

c: It demonstrates the relationship between pH and protein solubility Explanation

Explanation

d: It shows the rate of protein degradation Explanation

Explanation

4. What would likely happen if the pH of the buffer solution were adjusted to the protein's isoelectric point?

a: Protein would remain highly soluble Explanation

Explanation

b: Protein would precipitate and become insoluble Explanation

Explanation

c: Protein would degrade into smaller peptides Explanation

Explanation

d: There would be no change in solubility Explanation

Explanation

5. What is the purpose of drying the filter paper and protein in the oven?

a: To completely dissolve the protein Explanation

Explanation

b: To remove the moisture content and measure the dry weight of insoluble matter Explanation

Explanation

c: To sterilize the protein sample Explanation

Explanation

d: To convert the insoluble matter into a soluble form Explanation

Explanation

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