LD50 refers to the lethal dose that kills what percentage of the test population?

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Multiple Choice

LD50 refers to the lethal dose that kills what percentage of the test population?

Explanation:
LD50 is the dose that kills half of the test population. It’s a median lethal dose used in toxicology to compare how potent different substances are. In dose–response studies, researchers expose groups to increasing doses and see what fraction dies; the LD50 is the dose at which 50% die, which is why the number 50 appears in the name. This value can vary with species, route of exposure, and conditions, so it’s not a universal fixed number. Other points on the curve correspond to different percentages (like LD25 or LD75), and a 100% lethal dose would kill everyone, which is not the LD50.

LD50 is the dose that kills half of the test population. It’s a median lethal dose used in toxicology to compare how potent different substances are. In dose–response studies, researchers expose groups to increasing doses and see what fraction dies; the LD50 is the dose at which 50% die, which is why the number 50 appears in the name. This value can vary with species, route of exposure, and conditions, so it’s not a universal fixed number. Other points on the curve correspond to different percentages (like LD25 or LD75), and a 100% lethal dose would kill everyone, which is not the LD50.

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