BMS1041 amino acids

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1. The AA's valine, leucine and isoleucine have the following characteristics in common?

  • none of the above
  • they contain an acidic side chain
  • they contain a polar side chain
  • they are branched non polar aa's
  • they contain a basic side chain
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2. The amino acids with polar uncharged R groups are characterised by:

  • polar, uncharged groups in the side chains which can form H bonds eg OH, SH, C=O
  • polar, charged groups in the side chains which can form H bonds eg OH, SH, C=O
  • uncharged basic groups
  • uncharged acidic groups

3. Which component of the general structure of AA is acidic?

  • R-group
  • COO-
  • H
  • NH3+

4. Amongst AA's commonly found in proteins Glycine is unique as:

  • high concs are not found in alpha helices
  • it does not contain a chiral alpha carbon
  • the side chain contains only one hydrogen
  • all the things
  • it is commonly found in beta turns

5. 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

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