Researchers have determined that the growth of hormone-responsive breast cancer cells depends upon ____
a. the relative concentrations of ER? and ER? in the tumor cells
b. the ability of ER? to stimulate cancer cell growth
c. the ability of ER? to inhibit cancer cell growth
d. whether DNA binding sites exists for ER?, but not ER?
e. the relative concentrations of estrogen and testosterone in breast tissue
ANSWER: a
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According to the MacArthur-Wilson model, the mainland harbors ____
a. a lower species richness than islands b. a species pool from which species migrate to nearby islands c. none of the same species as on nearby islands d. an easier community to study than nearby islands e. many species that are extinct on nearby islands
Why is malaria such an effective disease? What will be an ideal response?
Destruction of the motor areas in the left cerebral
cortex results in the loss of a. sensation on the right side of the body. b. sensation on the left side of the body. c. voluntary movement on the left side of the body. d. voluntary movement on the right side of the body. e. involuntary control of the autonomic system.
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