BIOMOLECULES AND ENZYMES

Detailed explanation-1: -Dehydrogenases help in removal of hydrogen which is also called as oxidation. Oxidation is a process in which electrons are removed from a molecule or atom. That means oxygen molecule is added and hydrogen molecule is removed in the process.

Detailed explanation-2: -Dehydrogenase enzymes remove hydrogen ions and electrons from intermediates of this cycle, which are passed to the coenzyme NAD (forming NADH). The hydrogen ions and electrons are passed to the electron transport chain on the inner mitochondrial membrane. This occurs in both glycolysis and the citric acid cycle.

Detailed explanation-3: -Complex I (NADH dehydrogenase) is the first enzyme in the respiratory chain. It catalyses the electron transfer from NADH to ubiquinone that is associated with proton pumping out of the matrix.

Detailed explanation-4: -NADH is the electron donor in this system. It initiates the electron transport chain by donating electrons to NADH dehydrogenase (blue). NADH donates two electrons to NADH dehydrogenase. At the same time, the complex also pumps two protons from the matrix space of the mitochondria into the intermembrane space.