This protein is responsible for the conversion of alcohols to aldehydes in plants and is important for NAD metabolism during anaerobic respiration. a primary alcohol + NAD(+) = an aldehyde + H(+) + NADH a secondary alcohol + NAD(+) = a ketone + H(+) + NADH Binds 2 Zn(2+) ions per subunit. Homodimer. Belongs to the zinc-containing alcohol dehydrogenase family.