Why the cut apple becomes dark ?

When apple is cut, oxygen from the air reacts with the iron in the apple cells, forming iron oxides. This is just like rust that forms on the surface of iron objects. An enzyme called polyphenol oxidase (that's present in these cells) helps make this reaction go faster. Thus, apple becomes dark when cut. 
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Why TCA cycle is called by this name ?


 In TCA cycle, the first stable compound is citric acid which is a three carbon compound. Thus, TCA or Tricarboxylic acid is called by the name. 
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How many gross ATP molecules are formed during aerobic respiration in prokaryotes or eukaryotes ?

 40 ATP moelcules.
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Name the main processes for cell respiration.

Glycolysis, oxidation of pyruvate, Krebs’ cycle, electron transport chain and ATP synthesis.
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What is electron tranport system ?

Electron tranport system  (ETS) is the metabolic pathway through which the electron passes from one carrier to another. 
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