3. Describe the structure of a class I MHC molecule AND a classII MHC molecule with the following prompts:
a. number of polypeptide chains
b. domains of each polypeptide chain, including transmembraneand cytosolic domains
c. secondary structure
d. domain composition of the peptide-binding site
e. details of the architecture of the peptide-binding site
f. size of the peptide that can bind
