Assume that a lipid bilayer is 30 Å thick.
a. Calculate the number of amino acids it would take to span the membrane with an α helix.
b. Calculate the number of amino acids it would take to span the membrane with a β-strand.
c. Predict the transmembrane portion of the following peptide sequence: RGPKIPSIATGMVGALLLLVVALGIGILFMRRRH.