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Statement :I Glycolysis is the first ste...

Statement :I Glycolysis is the first step of respiration in which glucose completed break into `CO_2 and H_2O` Statement: II this process , there is a net gain of twenty -four molecules of ATP.

A

If both assertion and reason are true and reason is the correct explanation of assertion

B

If both assertion and reason are true but reason is not the correct explanation of assertion

C

If assertion is true but reason is false

D

If both assertion and reason are false.

Text Solution

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The correct Answer is:
D
Glycolysis is the process of breakdown of glucose or similar hexose sugar into two molecules of pyruvic acid through a series of enzyme mediațed reactions, releasing energy (ATP) and reducing power `(NADH_(2))`. It is the first step of respiration, which occurs inside the cytoplasm and is independent of `O_(2)`. In glycolysis, two molecules of ATP are consumed during double phosphorylation of glucose to form fructose 1, 6 diphosphate. Four molecules of ATP are produced in the conversion of 1, 3-diphosphoglycerate to 3-phosphogłycerate and phosphenol pyruvate to pyruvate whereas, two molecules of `NADH_(2)` are formed during oxidation of glyceraldehyde 3-phosphate to 1, 3-diphosphoglycerate. Since, each NADH is equivalent to 3 ATP, so net gain in glycolysis is 8 ATP.
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