What are dose-response curves, and what can they show?
What will be an ideal response?
Scientists estimate the toxicity of a chemical by determining the effects of various doses of the chemical on test organisms and plotting the results in a dose-response curve. One approach is to determine the lethal dose. A chemical's median lethal dose (LD50) is the dose that can kill 50% of the animals in a test population within a given time period.
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Which of the following features is associated with the global distribution of precipitation?
A. distribution of mountain ranges and high plateaus B. longitude C. albedo of the land surface D. deep water ocean circulation
In societies where women receive less formal education and hold fewer legal rights than do men, they are generally expected to have a large number of children, and men regard it as a sign of their own virility
Indicate whether the statement is true or false.
Natural gas is primarily composed of ________
A) methane B) oxygen C) carbon dioxide D) nitrogen E) hydrogen
Which of the following correctly describes the distribution and function of telomerase?
A) It is found in immortal cells and shortens long telomeres. B) It is found in somatic cells and shortens long telomeres. C) It is found in immortal cells and lengthens shortened telomeres. D) It is found in somatic cells and lengthens shortened telomeres.