This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
An alfa helix of a protein is most likely to be disrupted if a missense mutation introdues the following amino acid with in the alpha helical structure: 
Select and explain. 
A. Alanine, B. Aspaic acid, C. Tyrosine, D. Glycine
D: Glycine
Answer: D: Glycine 
Explanation: B i.e. Aspaic acid