Question

Which is never a part of a transmembrane protein?

Amino-acid side chains that are in contact with the non-polar aqeuous environment

Amino-acid side chains that are in contact with other parts of the transmembrane protein

Amino-acid side chains that are in contact with the polar aqueous environment outside of the membrane

Amino-acid side chains that are in contact with the non-polar phospholipid tails of the membrane

Amino-acid side chains that are in contact with the polar heads of the membrane phospholipids

Answer 1

Amino acid side chains that are in contact with polar aqueous environment never are part of transmembrane part of protein as in membrane non polar fatty acid tails only accomodate amino acids with non polar side chains. Hence Option C is should be chosen.