Question

If mitochondria is absent in mature RBC what will be the source of energy?
A. TCA
B. ETS
C. Link reaction
D. Glycolysis

Answer 1

Mitochondria are membrane-bound cell organelles (mitochondrion, singular) that generate most of the chemical energy needed to power the cell's biochemical reactions. Chemical energy produced by the mitochondria is stored in a small molecule called adenosine triphosphate (ATP).

Complete answer:
A. TCA- The citric acid cycle is also called the tricarboxylic acid cycle also called the Krebs cycle. It is a series of chemical reactions that are used by aerobic organisms to release stored energy with the help of oxidation of acetyl-CoA which is derived from carbohydrates, fats, proteins.

B. ETS- Electron transport system is called the metabolic pathway which helps in the transmission of an electron from one carrier to another. It is present in the inner mitochondrial membrane. Electrons from NADH that are produced during the citric acid cycle and are oxidized by NADH dehydrogenase.

C. Link reaction- This links glycolysis to the Krebs cycle called a citric acid cycle. Pyruvate molecules are decarboxylated which means it loses a molecule of carbon dioxide in the mitochondria. Pyruvate molecules are oxidized and then converted to acetyl coenzyme A.

D. Glycolysis- Glycolysis is a cytoplasmic pathway that helps is a breakdown of glucose into two three-carbon compounds that generate energy. Glucose is trapped by phosphorylation, which is dome by the enzyme hexokinase. Adenosine triphosphate is used in this reaction and the product, glucose-6-P, inhibits hexokinase.

Thus, the correct answer is option D glycolysis.

Note: Mitochondria is a double-membrane-bound organelle that is present in most eukaryotic organisms. Mature RBC lack mitochondria and hence has no functional Krebs cycle. They metabolize glucose mainly with the help of glycolysis, this yields 2 ATP for each glucose molecule.