Part I. Review of Stick Representations for Carbon-Containing Molecules:
A short-hand form of structures
for carbon-containing molecules is often used in organic chemistry. In
this representation, carbon atoms are represented by vertices and bonds
to hydrogen atoms are omitted. It is simple to convert the stick representations
back to the full representation which shows all atoms and bonds explicitly
by following the rules given below. Using these rules draw structures for
prostaglandin and penicillin V which explicitly show all C and H atoms.
Conversion rules:
1) Redraw molecule putting in a C atom at every vertex.
2) Carbon (when neutrally charged) always has four bonds. Add bonds to hydrogen atoms for every missing bond in the molecule.
Part II. Protein Structure
1) Draw a structure for the dipeptide
Ala-Asp.
2) Go to the CHE 300 web page located at:
facstaff.buffalostate.edu/bagleyka/che300.htm
Examine the links supplied as supplementary material for Lecture #2 and then answer the following questions.
a) What is meant by a proteins'
primary structure? Its secondary structure? Its tertiary structure?
b) Name and define the two major types of protein secondary structure.