Question

What are the reactants and end products of cellular respiration?

Answer 1

Glucose and oxygen are the reactants and the end products are carbon dioxide and water with the liberation of energy in form of ATP.

Explanation:

Cellular respiration occurs in living cells. It provides energy to the cell for carrying out its metabolic activities.

Glucose ( `C6H12O6`) is the substrate. It is broken down into `CO2` and `H2O` in presence of `O2`, with the liberation of energy in form of ATP molecules.

Cellular respiration occurs in 2 steps:
Glycolysis and Kreb's cycle or Citric acid cycle .

Glucolysis occurs in absence of oxygen . Glucose is converted into fructose 1;6 di-phosphate that is converted into 2 molecules of pyruvic acid in a series of steps of glycolysis.

Pyruvic acid is converted into oxalacetate that enters Kreb's cycle . Kreb's cycle occurs in presence of oxygen. During Kreb's cycle, `CO2` and `NADPH2` are produced. `NADPH2` is oxidised into `NADP` in presence of `O2` to generate ATP molecules. This process is termed oxidative phosphorylation .