g Select all mechanisms of electron transfer found in biological systems. Select one or more: Electrons are directly transferred from inorganic molecules such as iron and copper. Electrons can be transferred through direct combination with coenzymes. Electrons can be transferred as protons, H Electrons can be transferred as free particles, e-

Electrons are directly transferred from inorganic molecules such as iron and copper.

Electrons can be transferred through direct combination with coenzymes.

Explanation:

Electrons arising from the action of dehydrogenases that collect electrons from catabolic pathways are transferred into the respiratory chain of oxidative phosphorylation.

These electrons are transferred through the nicotinamide nucleotides NAD⁺ and NADP⁺ or the flavin nucleotides, FAD or FMN, which are coenzyemes.

Electrons are also transferred directly from inorganic molecules such as iron in the reduction of iron (iii) to iron (ii), as well as copper found in the complex (IV) of the electron transport chain.

Electrons are not transferred as protons but the energy of electron transfer is used to drive proton pumps.

Likewise too, electrons are not transferred as free particles.