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68. The conversion of G3P (PGAL) to pyruvate involves
A) anaerobic respiration
B) photophosphorylation
C) the electron transport chain
D) substrate-level phosphorylation
E) the Krebs cycle

Sagot :

Marianaegarciaperedoidn

During glycolysis, glucose molecules are turned into PGAL molecules and then into pyruvate. This process occurs in the cytoplasm and does not need oxygen to occur. The correct option is A) anaerobic respiration.

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Glycolysis

Glycolysis is the process through which the cell partially decomposes glucose and turns it into pyruvate.

Oxygen requirements

These enzymatic reactions occur in the cytosol, and they need no oxygen to occur.

So this step is shared by aerobic and anaerobic respiration.  

 

Phases

It can be divided into two phases

  • 1st phase produces two 3-C molecules, the phosphoglyceraldehyde (PGAL) molecules. This step requires the energy of two ATP molecules to convert glucose.

  • 2nd phase produces pyruvate, two ATP, and one NADH from each 3-C molecule.

Glycolysis transforms one glucose molecule (6-C) into two phosphoglyceraldehyde and then into two pyruvate molecules (3-C), four ATP, and two NADH. Since it also consumes two ATP molecules, the net product is two ATP.

Pyruvate destiny

After glycolysis, pyruvate enters the Krebs cycle.  

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You can learn more about Glycolysis at

https://brainly.com/question/10886602

https://brainly.com/question/13251366

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