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
Least energy producing cycle 
Select and explain. 
A. Glycolysis, B. Kreb's cycle, C. HMP shunt, D. Fatty acid oxidation
C: HMP shunt
Answer: C: HMP shunt 
Explanation: Ans. is 'c' i.e.,HMP shunt HMP shunt does not produce energy.HMP shunt is paicularly impoant for two purposes :-Synthesis of ribose for nucleotide and nucleic acid formation.Formation of NADPH which plays impoant role in several other biological processes, e.g. synthesis of fatty acids, cholesterol, steroid hormones and neurotransmitters.