Which toxin is the most lethal?

• Toxin A

• Toxin B

The measure of how harmful a substance is to an organism:

• toxicity

• emerging disease

• pathogenesis

• pollution

the effect on an organism at different levels of exposure to a pollutant or other hazardous substance

• dose-response relationship

• pathogen

• risk assessment

• environmental health

Tags

NGSS.HS-LS2-7

What is the primary factor that determines the toxicity of a substance?

• Color

• Smell

• Dosage

• Origin

Tags

NGSS.HS-PS1-5

What is the LD50?

• 75

• 125

• 250

• 500

LD50 is the dose that is lethal to ____ percent of the population

Honeybee venom has an LD50 of 2.8 mg/kg. You gave 10 rats that each weigh 1-kg a dose of 2.8 mg. How many would survive?

• less than half

• 5

• more than half

• none

Yellowjacket venom has an LD50 of 3.5 mg/kg. If you had 48 rats that each weighed 1 kg and they all got stung with 3.5 mg of yellowjacket venom, what is the outcome?

• 12 die

• 24 die

• 36 die

• none die

Using the table, which substance is the least toxic?

• table salt

• snake venom

• sugar

• caffeine

Which substance(s) are damaging to your kidneys?

• table salt

• bleach

• arsenic

• sugar

• lead