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Natural proteins are composed primarily of $20$ $\alpha$-amino acids. Which one of the following statements is true for any of these amino acids in a solution of pH $1.5$?

  1. Only the amino group is ionized.
  2. Only the carboxylic acid group is ionized.
  3. Both amino and carboxylic acid groups are ionized.
  4. Both amino and carboxylic acid groups are neutral.
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