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Subject - Chemistry:

Basics

MCQ - 572-2758

Question:

Acidic amino acids have

  1. 2 amino groups and 1 carboxylic group
  2. 1 amino and 1 carboxylic groups
  3. 2 carboxylic groups and 1 amino group
  4. 1 amino and 1 carboxylic groups

Correct Answer: C

Explanation:

Those amino acids have acidic side chains at neutral pH. These are aspartic acid or aspartate (Asp) and glutamic acid or glutamate (Glu). Their side chains have carboxylic acid groups whose pKa's are low enough to lose protons, becoming negatively charged in the process

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