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What is the isoelectric point of a protein?

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Question: What is the isoelectric point of a protein?

Options:

  1. The pH at which the protein is positively charged
  2. The pH at which the protein is negatively charged
  3. The pH at which the protein has no net charge
  4. The pH at which the protein denatures

Correct Answer: The pH at which the protein has no net charge

Solution: 

The isoelectric point of a protein is the pH at which the protein has no net charge, leading to minimal solubility.

What is the isoelectric point of a protein?

Practice Questions

Q1
What is the isoelectric point of a protein?
  1. The pH at which the protein is positively charged
  2. The pH at which the protein is negatively charged
  3. The pH at which the protein has no net charge
  4. The pH at which the protein denatures

Questions & Step-by-Step Solutions

What is the isoelectric point of a protein?
  • Step 1: Understand that proteins are made of amino acids, which can have positive, negative, or neutral charges depending on the pH of their environment.
  • Step 2: Know that pH is a measure of how acidic or basic a solution is, with lower values being more acidic and higher values being more basic.
  • Step 3: Realize that at different pH levels, the charges on the amino acids in a protein can change.
  • Step 4: Identify the isoelectric point (pI) as the specific pH where the total charge of the protein is zero, meaning it has no net charge.
  • Step 5: Understand that at the isoelectric point, the protein is least soluble in water, which can lead to precipitation.
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