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 positive 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.
  • Behaves as a acid and accepts a proton forming a negative ion.
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Other questions in this quiz

2. Does a zwitterion have a charge?

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

3. The R group on an amino acid can contain...

  • OH, SH, COOH, NH2
  • NH2
  • COOH, O, NH
  • SH, NH2, O, OH

4. What is an amino acid?

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

5. What is the isoelectric point?

  • The pH value at which a positive amino acid is formed.
  • 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 negative amino acid is formed.

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