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
Tricarboxylic acid cycle does not occur in: 
Select and explain. 
A. Muscle cell, B. Red blood cell, C. Nerve cell, D. Liver cell
B: Red blood cell
Answer: B: Red blood cell 
Explanation: The electron transpo and oxidative phosphorylation systems and the enzymes required for the citric acid cycle are located in the mitochondria of cells, which are the major source of ATP for energy-consuming reactions in most tissues.The citric acid cycle does not occur in all cells.For example, mature human red blood cells do not contain mitochondria and the cycle is absent.In these cells, ATP is formed by the anaerobic conversion of glucose to lactate (anaerobic glycolysis).