Amino Acids

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

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

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

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

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

4. What is an amino acid?

  • The building blocks for the biological molecules, peptides and proteins.
  • They are substances found only in the body to form proteins.
  • The building blocks for biological molecules, polyesters.
  • They are organic compounds with the carboxylic acid functional group

5. 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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