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6. The amino acids with 'acidic R groups' are characterised by?
- the AA's aspartate and glutamate. The negatively charged side chains can form electrostatic interactions with positively charged basic side chains.
- side chains with a positive physiological pH
- 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 negative physiological pH
7. Desmosine is an AA...
- formed of four glycine residues
- formed of four lysine residues
- formed of four hydroxyproline residues
- formed of four hydroxylysine residues
- formed of four hydroxyproline and hydroxylysine residues
8. The AA's hydroxyproline and hydroxylysine...
- 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, which require vit C as an enzyme cofactor for their synthesis
- are hydroxylated forms of proline and lysine, thus not encoded by the genetic code
- are translated from specific DNA sequences
9. The AA with aromatic R groups are characterised by:
- an aromatic ring structure which gives these AA their characteristic UV spectra
- a strong flagrance, as referred to by aromatic
- a high carbon content
- an aromatic ring structures
10. Proline:
- Commonly found in beta turns
- is an uncommon AA
- commonly found in alpha helices
- always hydroxylated to hydroxyproline
- never found in collagen
11. The AA with 'non-polar' aliphatic R groups are characterised by:
- high levels of acidic or basic groups
- high levels of carbon and oxygen atoms in the side chain
- high levels of carbon and hydrogen in the side chain
- high levels of hydrogen bonding between carbon and hydrogen atoms in the side chain
12. The amino acids with 'basic R groups' are characterised by:
- The AA's arginine and leucine which both have positively charged side chains at neutral pH
- The AA's arginine and leucine with both have a negatively charged side chain and neutral pH
- May contain histidine, which has a side chain that is always positively charged at physiological pH
- A negative charge at physiological pH