What chemical causes death in many eukaryotes because it blocks cytochrome C oxidase?

Question

Quizplus · Accepted Answer

Cyanide is known to block cytochrome C oxidase, which is a vital enzyme in the electron transport chain of aerobic respiration. This results in the cessation of cellular respiration and the eventual death of many eukaryotes. Copper and iron can also be toxic at high levels, but they do not specifically block cytochrome C oxidase. Oxygen is necessary for life, and carbon monoxide is a poisonous gas that interferes with the ability of hemoglobin to transport oxygen, but they do not block cytochrome C oxidase.

What Chemical Causes Death in Many Eukaryotes Because It Blocks