Enzymes in respiration

Honestly – it’s the last thing you have to do on respiration!

Oxidoreductases

Key enzymes in redox reactions.E.g. enzymes that transfer electrons,

hydrogen or oxygen from one molecule to another.

Ethanal + NADH + H+ ethanol + NAD+

alcohol dehydrogenase

Decarboxylase

An enzyme that catalyses the reaction to remove carbon dioxide from a molecule.

e.g. in anaerobic respiration

Pyruvate ethanal + carbon dioxidedecarboxylase

Dehydrogenase

An enzyme that removes hydrogen from a molecule.

e.g. such as found during Kreb’s cycle.The activity of this enzyme can be

measured using an artificial hydrogen acceptor such as TTC (triphenyl tetrazolium chloride – which turns pink!)