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Chemistry 1LD Practice Test

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Which term describes a toxic substance made by living organisms?
Correct Answer:
Toxin
Explanation:
A toxin is a poisonous substance produced by a living organism. This term specifically refers to poisons that are biologically synthesized, such as botulinum toxin from bacteria, snake venoms, or aflatoxins from fungi. In contrast, a toxicant is a broad category that includes any toxic substance, often encompassing chemicals from non-biological or synthetic sources. LD50 and LC50 are not substances at all; they’re measurements the amount or concentration of a substance needed to kill 50% of a test population, used to quantify toxicity. So the best term for a toxic substance made by living organisms is toxin.

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