Biochemistry – MCQ 78 – Transmembrane region of protein

The transmembrane region of protein is likely to have
A. A stretch of hydrophilic amino acids
B. A stretch of hydrophobic amino acids
C. A disulphide loop
D. Alternating hydrophilic and hydrophobic amino acids

Correct answer : B. A stretch of hydrophobic amino acids

Cell membrane has a lipid core. Hence the transmembrane region of proteins contain hydrophobic amino acids. The ends of transmembrane proteins contain hydrophilic amino acids.