The reason that the steroid hormone aldosterone affects only a small number of cells in the body is that _____
A) only its target cells get exposed to aldosterone
B) only its target cells contain aldosterone receptors
C) it is unable to enter nontarget cells
D) nontarget cells destroy aldosterone before it can produce any effect
B
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Which of the following female organisms contain two different sex chromosomes?
a. humans b. fruit flies c. cows d. butterflies e. cats
Greenhouse gases block
A. carbon dioxide molecules escape from Earth. B. heat escape from Earth. C. oxygen molecules escape from Earth. D. UV wavelengths escape from Earth. E. UV wavelengths from reaching Earth's surface.
The uptake of foreign DNA into bacterial cells is called ________
A) translation B) transcription C) transgenesis D) transfection E) transformation
A human host can prevent a pathogen from getting enough iron by all of the following except
a. reducing dietary intake of iron. b. binding iron with transferrin. c. binding iron with hemoglobin. d. binding iron with ferritin. e. binding iron with siderophores.