Amino Acids

A test on pages 48-49 of the OCR A A2 chemistry textbook

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1. At a pH more acidic than the isoelectric point...

  • Behaves as a acid and accepts a proton forming a negative ion.
  • Behaves as a base and accepts a proton forming a positive ion.
  • Behaves as a acid and accepts a proton forming a positive ion.
  • Behaves as a base and accepts a proton forming a negative ion.
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2. What is a zwitterion?

  • A negatively charged form of the amino acid.
  • A dipolar ionic form of an amino acid that is formed by the donation of a hydrogen ion from the carboxyl group to the amino group.
  • The pH value at which the amino acid exists as an isoelectric ion.
  • A positively charged form of the amino acid.

3. What groups do alpha amino acids (those in the body) need to have?

  • A basic amine group and an acidic carboxyl group connected to the same carbon
  • A basic amine group and an acidic carboxyl group
  • A acidic amine group and a basic carboxyl group
  • A acidic amine group and a basic carboxyl group connected to the same carbon atom

4. What are amino acids soluble in?

  • Acids and bases
  • Bases
  • Everything
  • Acids

5. What are assembled into proteins?

  • Amino acids
  • Esters
  • Carboxylic acids
  • Acids

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