Back to quiz

6. What is a zwitterion?

  • The pH value at which the amino acid exists as an isoelectric ion.
  • 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.
  • A positively charged form of the amino acid.
  • A negatively charged form of the amino acid.

7. Does a zwitterion have a charge?

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

8. What are assembled into proteins?

  • Carboxylic acids
  • Amino acids
  • Esters
  • Acids

9. What is the simplest amino acid?

  • Proline
  • Glycine
  • Alanine
  • Serine

10. 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.

11. What is a peptide?

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

12. 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.

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

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