Question

Reactive oxygen species (ROS) are unstable oxygen-containing molecules that can cause damage to enzymes and membranes. Cells can defend against damage by converting these ROS to Harmless species.Complete the following reactions by replacing the question mark with the appropriate formula. Choose the correct enzyme or enzyme class.2 O_2_ + 2H+ ---?----> ? + O_2_ (What are the two ?)? + 2 GSH ---?---> 2 H_2_O + GS-SH (What are the two ?)

Answer 1

Answer:

The two enzymes are Superoxide dismutase and glutathione peroxidase.

Explanation:

                             2O2+2H+ = H2O2+02

The above reaction is catalyzed by superoxide  dismutase which deals with the conversion of superoxide into hydrogen peroxide(H2O2).

                              H2O2 +  2GSH = 2H2O + GS-SG

The above reaction is catalyzed by glutathione peroxidase in which the reduced glutathione  reacts with hydrogen peroxide(H2O2) to form H2O by reduction and oxidized glutathione by oxidation.The above reaction is a redox reaction which mean in this reaction both oxidation and reduction taking place simultaneously.The reaction occur to minimize the toxic effect of H2O2.