Question

What will be the metabolic fate of pyruvic acid in absence of oxygen?
A. Partial oxidation will take place
B. Complete oxidation
C. Utilization of reoxidation of NADH
D. Dependent on energy need

Answer 1

Hint:Pyruvic acid is defined as 2-oxo monocarboxylic acid that is the 2-keto derivative of propionic acid.
It is a metabolite obtained during glycolysis.
It has a role as a fundamental metabolite and a cofactor.
It derives from propionic acid.
It is the conjugate acid of pyruvate.

Complete answer: Glycolysis is an oxygen-independent metabolic pathway.
It is a metabolic pathway that converts glucose into pyruvate and pyruvic acid and hydrogen ions.
The free energy used in this process is used to form high energy molecules like ATP (Adenosine triphosphate) and NADH (reduced nicotinamide adenine dinucleotide).
The glycolysis pathway can be separated into two phases:
1.The preparatory phase: where ATP is consumed
2.The pay off phase: where ATP is produced
In the process of glycolysis, a net profit of two ATP was produced, two NAD ions were reduced to two NADH plus Hydrogen ions, and glucose was split into two pyruvate molecules. In the absence of oxygen, pyruvate will undergo a process known as fermentation. In the process of fermentation, the NADH and NAD ions from glycolysis will be recycled back to NAD ions so that glycolysis can continue.

So, the correct option is option C) Utilization of reoxidation of NADH.

Note: In most organisms, glycolysis occurs in the cytosol.
The most common type of glycolysis is the Embden–Meyerhof–Parnas (EMP) pathway, which was discovered by Gustav Embden, Otto Meyerhof, and Jakub Karol Parnas.
Glycolysis also refers to other pathways, such as the Entner–Doudoroff pathway and various heterofermentative and homofermentative pathways.