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 through a condensation reaction.
  • A compound made of amino acids linked by peptide bonds.
  • A compound formed from monomer units bonded by ester linkages.
  • A compound made of carboxylic acids linked by peptide bonds.
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2. What are amino acids soluble in?

  • Bases
  • Acids and bases
  • Acids
  • Everything

3. What is the isoelectric point?

  • The pH value at which a positive amino acid is formed.
  • The pH value at which the amino acid exists as a zwitterion.
  • The pH value at which a negative amino acid is formed.
  • A dipolar ionic form of an amino acid.

4. How many different amino acids does the body have?

  • 30
  • 20
  • 25
  • 40

5. At a pH more alkaline than the isoelectric point...

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

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