Transporting a solute against its concentration
gradient requires
a. energy.
b. a gated channel.
c. exocytosis.
d. hypotonic and hypertonic differences across
the cell membrane.
e. more than one of these.
A
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Because of a population crash in 1775, the Pingalese have the highest incidence of ____________ in
the world. A. hemophilia D. amytrophic lateral sclerosis B. cystic fibrosis E. Huntington disease C. achromatopsia
Each of the following proteins is a component of both costameres and focal adhesions except
A) ?1-integrin. B) vinculin. C) talin. D) ?-actinin. E) dystrophin.
Industrial melanism involving the peppered moths (Biston sp.) is cited as an example of natural selection that has been observed in the last one hundred years. Recall that the peppered moth exhibits two distinct morphological types with dark and light colored wings. Which of the following statements about changes in these two types of moths as a result of industrial melanism is true?
A. The dark forms are selected against in nonpolluted forests. B. The dark forms are distasteful to birds and are thus safe in polluted forests. C. Dark forms emigrate from nonpolluted forests to polluted forests. D. The light forms are selected against in nonpolluted forests. E. Birds prey more on the dark forms in polluted forests
The use of microbes to clean up toxic pollutants is known as: