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 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
  • The AA's arginine and leucine with both have a negatively charged side chain and neutral pH
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2. The amino acids with 'acidic R groups' are characterised by?

  • side chains with a negative physiological pH
  • the AA's aspartate and glutamate. The negatively charged side chains can form electrostatic interactions with positively charged basic side chains.
  • the AA's lysine and arginine. The negatively charged side chains can form electrostatic interactions with positively charged basic side chains
  • side chains with a positive physiological pH

3. The AA with aromatic R groups are characterised by:

  • a high carbon content
  • an aromatic ring structures
  • an aromatic ring structure which gives these AA their characteristic UV spectra
  • a strong flagrance, as referred to by aromatic

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

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

  • they contain a basic side chain
  • none of the above
  • they are branched non polar aa's
  • they contain an acidic side chain
  • they contain a polar side chain

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