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  • The Glycolysis and Citric Acid cycles are important pathways to generate energy in the cell. Given below are statements regarding the production of ATP. P. Elec

The Glycolysis and Citric Acid cycles are important pathways to generate energy in the cell. Given below are statements regarding the production of ATP.

P. Electrons released during the oxidative steps of glycolysis and citric acid cycle produce 10 molecules of NADH and 2 molecules of FADH2 per molecule of glucose.

Q. Electrons released during the oxidative steps of glycolysis and citric acid cycle produce 20 molecules of NADH and 4 molecules of FADH2 per molecule of glucose. 

R. The coenzymes produced are oxidized by the electron transport chain.

S. The conversion of ADP and P, to ATP takes place in the intermembrane space of mitochondria.

Which one of the following combinations of the above statements is correct?

Option: 1

P and Q


Option: 2

Q and R


Option: 3

R and S


Option: 4

P and R


Answers (1)

best_answer

The conversion of ADP (adenosine diphosphate) and P (inorganic phosphate) to ATP (adenosine triphosphate) does not take place in the intermembrane space of the mitochondria. Instead, this process occurs within the inner mitochondrial membrane, specifically in the regions known as the cristae.

The inner mitochondrial membrane contains the electron transport chain, which consists of protein complexes that transport electrons from NADH and FADH2. As electrons pass through the electron transport chain, protons (H+) are pumped from the mitochondrial matrix to the intermembrane space, creating a proton gradient.

The ATP synthase enzyme, which is embedded in the inner mitochondrial membrane, utilizes the energy from the proton gradient to convert ADP and P into ATP. The synthesis of ATP occurs in the mitochondrial matrix, utilizing the energy provided by the flow of protons back into the matrix through the ATP synthase complex.

Hence statements Q and S are wrong and thus, making option 4 the correct answer.

Posted by

rishi.raj

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