Amino Acids

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

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1. What is the isoelectric point?

  • A dipolar ionic form of an amino acid.
  • The pH value at which the amino acid exists as a zwitterion.
  • The pH value at which a positive amino acid is formed.
  • The pH value at which a negative amino acid is formed.
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2. 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

3. What are assembled into proteins?

  • Carboxylic acids
  • Acids
  • Amino acids
  • Esters

4. Does a zwitterion have a charge?

  • No
  • Yes
  • A positive charge
  • A negative charge

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

  • 30
  • 20
  • 25
  • 40

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