BMS1041 amino acids

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1. The amino acids with 'basic R groups' are characterised by:

  • A negative charge at physiological pH
  • The AA's arginine and leucine with both have a negatively charged side chain and neutral pH
  • The AA's arginine and leucine which both have positively charged side chains at neutral pH
  • May contain histidine, which has a side chain that is always positively charged at physiological pH
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2. Which component of the general structure of AA is acidic?

  • COO-
  • R-group
  • NH3+
  • H

3. The AA's hydroxyproline and hydroxylysine...

  • are translated from specific DNA sequences
  • are hydroxylated forms of proline and lysine, which require vit C as an enzyme cofactor for their synthesis
  • are hydroxylated forms of proline and lysine, which require vit C as an enzyme cofactor for the synthesis and are found at high levels in collagen
  • are hydroxylated forms of proline and lysine, thus not encoded by the genetic code

4. The AA with 'non-polar' aliphatic R groups are characterised by:

  • high levels of acidic or basic groups
  • high levels of carbon and hydrogen in the side chain
  • high levels of hydrogen bonding between carbon and hydrogen atoms in the side chain
  • high levels of carbon and oxygen atoms in the side chain

5. Desmosine is an AA...

  • formed of four lysine residues
  • formed of four hydroxyproline and hydroxylysine residues
  • formed of four glycine residues
  • formed of four hydroxyproline residues
  • formed of four hydroxylysine residues
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