This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Microbiology
Aminoacyl - tRNA is required for all Except 
Select and explain. 
A. Hydroxyproline, B. Methionine, C. Cystine, D. Lysine
A: Hydroxyproline
Answer: A: Hydroxyproline 
Explanation: Hydroxyproline is a derived amino acid and there is no tRNA available to transpo derived amino acids.Hydroxyproline and hydroxylysine are two examples of derived amino acid for which there is no t-RNA available.