What configures a TRANSMEMBRANE domain more than one answers

What configures a TRANSMEMBRANE domain?

(more than one answers may be correct)

Solution

a)A stretch of amino acids intercalated by non-polar and polar amino acids where all non-polar amino acids face the membrane and polar amino acids produce a hydrophilic lumen.

d)At least 20 amino acids in a row that have non-polar side chains.

They are mostly composed of hydrophobic amino acid residues and little hydrophilic residues,such as charged and polar residues.