Question

The complete oxidation of glucose yields usable energy in the form of
A.FADH2
B. coenzyme A
C. ATP
D. pyruvic acid

Answer 1

HELLO
D
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Answer 2

Answer:

Option C. ATP

Explanation:

• The product of glycolysis is pyruvate which is reduced to ethanol or lactic acid in anaerobic respiration. But it is completely oxidised to CO₂ and H₂O through the citric acid cycle and electron transport chain in aerobic respiration.

• Oxidative phosphorylation is governed by the electron movement through the electron transport chain (ETC).

• The NADH and FADH₂ are produced in other steps, depositing their electrons in the ETC, turning back into the empty forms i.e. NAD⁺ and FAD.

• As electrons move down the chain, energy gets released and used to pump protons out of the matrix, forming a gradient.

• The protons then flow back into the matrix through ATP synthase, making ATP. At the end of ETC, oxygen accepts e⁻ and takes up the H⁺ to form water.

• Thus there is a total net gain of 38 ATP molecules during aerobic respiration of 1 molecule of glucose. Out of which 2 mol. ATP is required for transporting the NADH produced in glycolysis taking place in the cytoplasm into mitochondria for further oxidation.

• So the net gain of usable energy is 36 ATP molecules.

Hence option C is the correct option.