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
Pyruvate can be conveed directly into all the following except : 
Select and explain. 
A. Phosphoenol pyruvate, B. Alanine, C. Acetyl CoA, D. Lactate
A: Phosphoenol pyruvate
Answer: A: Phosphoenol pyruvate 
Explanation: A i.e. Phosphoenol PyruvatePyruvate can be directly conveed to acetyl CoA (by oxidative decarboxylation), oxaloacetate (by carboxylation), alanine (transamination); and lactate (in anaerobic conditions). But pyruvate can not be directly conveed to phosphoenol pyruvate (a reaction of gluconeogenesis)Q. However, phosphoenol pyruvate can be directly conveed to pyruvate (in glycolysis)Q.