Biology
Biology
12th Edition
ISBN: 9780134813448
Author: Audesirk, Teresa, Gerald, Byers, Bruce E.
Publisher: Pearson,
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Chapter 8.3, Problem 1HYEW

Cyanide is a favorite poison in old murder mysteries, causing the hapless victim to die almost instantly. Cyanide exerts its lethal effects by blocking the last protein in the ETC: an enzyme that combines energy-depleted electrons with oxygen. If these electrons are not carried away by oxygen, they act like a plug in a pipeline. Additional high-energy electrons cannot trawl through the ETC, so no more hydrogen can be pumped across the membrane, and ATP production by chemiosmosis stops abruptly. Because the energy demands of our cells are so great, blocking cellular respiration with cyanide can kill a person within a few minutes.

Why Cyanide Is So Deadly?

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