The citric acid cycle is a stage of catabolism that oxidizes acetate into carbon dioxide and generates energy. There are eight enzymes involved in the citric acid cycle.

Which enzymes produce carbon dioxide as a product?

A. malate dehydrogenase
B. isocitrate dehydrogenase
C. α‑ketoglutarate dehydrogenase
D. succinate dehydrogenase

Isocitrate dehydrogenase and α‑ketoglutarate dehydrogenase are the two enzymes that produces carbon dioxide as a by-product.

Explanation:

The release of carbon dioxide from any compound is known as decarboxylation. The first step where carbon dioxide is released as a by product is when Isocitrate is oxidized and decarboxylated to α‑ketoglutarate and this reaction is catlyzed by isocitrate dehydrogenase. The second step where carbon dioxide is released as a by product is from decarboxylation of   α‑ketoglutarate into succinyl-Co A and this reaction is catalyzed by α‑ketoglutarate dehydrogenase.

explanation:

b,bacteria convert nitrates

into nitrogen gas.

d,plants and animals take in

and use nitrogen compounds.

e,bacteria break down waste    

products and return nitrogen  

to the soil.

a,bacteria convert atmospheric

nitrogen to ammonia.

c,bacteria convert ammonia

to nitrites and nitrates.