This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: membrane structure and function, Subject name: Biochemistry
[{'content': 'The transmembrane region of a protein is likely to have \nSelect and explain. \nA. A stretch of hydrophilic amino acids, B. A stretch of hydrophobic amino acids, C. A disulphide loop, D. Alternating hydrophilic and hydrophobic amino acids', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Some of the integral membrane proteins span the whole bilayer and they are called transmembrane proteins (Fig. 2.4). The hydrophobic side chains of the amino acids are embedded in the hydrophobic central core of the membrane. The transmembrane proteins can serve as receptors (for hormones, growth factors, neurotransmitters), tissue-specific antigens, ion channels, membrane-based enzymes, etc.Ref: DM Vasudevan, page no: 12', 'role': 'assistant'}]