Q.

Given below are two statements : 
Statement-I : In the mitochondrial electron transport chain, the number of ATP formed depends on the nature of the electron donor.
Statement-II : In respiration, oxidation of one NADH+H+ yields 3 ATP and oxidation of one FADH2 yields 2 ATP in ETS.
In the light of the above statements, choose the correct answer from the options given below :

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a

Statement I is false but Statement II is true 

b

Both Statement I and Statement II are true 

c

Both Statement I and Statement II are false 

d

Statement I is true but Statement II is false  

answer is C.

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Detailed Solution

Statement-I is true. The number of ATP formed in the mitochondrial electron transport chain can depend on the nature of the electron donor. This is because different electron donors feed electrons into the electron transport chain at different points, leading to variations in the number of protons pumped across the inner mitochondrial membrane and ultimately affecting the ATP yield through chemiosmosis.

Statement-II is true. In aerobic respiration, the oxidation of one NADH+H+ molecule typically yields approximately 3 ATP through the electron transport chain, while the oxidation of one FADH2 molecule yields approximately 2 ATP. 

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