A) mitochondrial matrix
B) cytoplasm
C) lysosome
D) nucleus
Correct Answer: A
Solution :
Krebs cycle (TCA or citric acid cycle) was discovered by Hans Krebs. It operates in matrix of mitochondria. The pyruvic acid formed by glycolysis enters into mitochondria and undergo oxidative decarboxylation to produce acetyl Co-A, NADH and \[\text{C}{{\text{O}}_{\text{2}}}\text{.}\]Acetyl Co-A is the substrate entrant of Krebs cycle. In the Krebs cycle the acetyl Co-A is completely oxidised to \[\text{C}{{\text{O}}_{\text{2}}}\text{.}\]and \[{{\text{H}}_{\text{2}}}\text{O}\text{.}\]The net product from one acetyl Co-A is 12 ATP molecules. Glycolysis takes place in cytoplasm of the cell. Here one molecule of glucose splits into two molecules of pyruvic acid. Lysosome contains hydrolytic enzymes. Nucleus is the control centre of cell. It contains genetic material.
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