Part IIl. Use Model 2A to answer questions 13 through 17. A ribbon diagram (show
ID: 185990 • Letter: P
Question
Part IIl. Use Model 2A to answer questions 13 through 17. A ribbon diagram (shown in yellow) has been superimposed on a stick diagram of a protein a helix. 13. Label the N and C terminus with"N" and 4. Circle four peptide bonds. 15. What intramolecular force stabilizes secondary structures Model 2A Protein a helix ribbon diagram (in yellow) superimposed on a stick but is not explicitly shown on a ribbon diagram diagram. R-groups are shown as purple balls 16. What groups are not represented on a ribbon diagram (in yellow)? 7. What does the ribbon diagram reveal about the peptide structureExplanation / Answer
1. As one turn of helix contains on an average 3.6 amino acids. There fore amino acid in a helix are at 100 degrees.
So first amino acid residue will be at 100 degree from 12 O' clock position
Second will be at 200 degree from 12 o clock position
Third will be at 300 degree from 12 O' clock
The fourth amino acid residue will be in the next turn and at 40 degrees from 12 O 'Clock position.
2. The amino acid residues are facing towards the exterior of alpha helix.