In respiration, molecular oxygen is used in __________.
a) ETS
b) Hatch-Slack pathway
c) TCA cycle
d) Glycolysis

Dear student,
Please find below the answer:

The correct option is (a).
In respiration, molecular oxygen is used in the electron transport system. In ETC (electron transport chain) the electrons which are produced by NADH pass sequentially through complex I, II, III, IV, and V which are located in the inner membrane of mitochondria. In this process, the oxygen acts as the final electron acceptor and accepts hydrogen generated in the process to make water. This results in the removal of the hydrogen from the system and the complete entire process. Thus, oxygen drives the completion of ETC.

Hope this clears your doubt.
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