Scientists have developed an ointment to decrease muscle inflammation after intense workouts or trainings. To test the product, 99 weight lifters are divided into three equal groups. Group 1 is given the actual ointment, Group 2 is given an inactive ointment that looks and smells like the active ointment, and Group 3 is not allowed to use any treatment. Group 2 has been given
A. a placebo.
B. a standardized variable.
C. a control variable.
D. the active ointment.
E. an independent variable.
A. a placebo.
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What will be an ideal response?
In the Ames test for mutagenicity,
A) reverse mutations convert auxotrophs to prototrophs that survive. B) colonies are due to forward mutations that convert prototrophs to auxotrophs. C) cells are treated with mutagen and only cells with no mutations survive. D) cells are treated with excess amino acids and cells with mutations are killed. E) rat liver enzymes are present to protect cells from mutation.
A molecule consists of ____
a. radioactive compounds b. two or more atoms of the same element c. electrically charged elements d. elements with one or more extra neutrons e. atoms held together by chemical bonds
Transmission of the pathogen of leishmaniasis is by the
A. tsetse fly. B. phlebotomine (sand) fly. C. reduviid, "kissing," bug. D. hard bodied tick. E. Anopheles mosquito.