Amino Acids

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

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1. What is a peptide?

  • A compound formed from monomer units bonded by ester linkages.
  • A compound formed through a condensation reaction.
  • A compound made of amino acids linked by peptide bonds.
  • A compound made of carboxylic acids linked by peptide bonds.
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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. At a pH more alkaline than the isoelectric point...

  • Behaves as a base and donates a proton forming a negative ion.
  • Behaves as a acid and donates a proton forming a negative ion.
  • Behaves as a acid and donates a proton forming a positive ion.
  • Behaves as a base and donates a proton forming a positive ion.

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

  • Behaves as a base and accepts a proton forming a positive ion.
  • Behaves as a base and accepts a proton forming a negative ion.
  • Behaves as a acid and accepts a proton forming a positive ion.
  • Behaves as a acid and accepts a proton forming a negative ion.

5. What is the simplest amino acid?

  • Proline
  • Serine
  • Glycine
  • Alanine
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