What type of net caused many dolphins to drown while tuna were being fished?
a. Purse seines
b. Trawl nets
c. Drift nets
d. Gill nets
a
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Elephants are not the most dominant species in African grasslands, yet they influence community structure
The grasslands contain scattered woody plants, but they are kept in check by the uprooting activities of the elephants. Take away the elephants, and the grasslands convert to forests or to shrublands. The newly growing forests support fewer species than the previous grasslands. Which of the following describes why elephants are the keystone species in this scenario? A) Elephants exhibit a disproportionate influence on the structure of the community relative to their abundance. B) Grazing animals depend upon the elephants to convert forests to grassland. C) Elephants prevent drought in African grasslands. D) Elephants are the biggest herbivore in this community. E) Elephants help other populations survive by keeping out many of the large African predators.
Which of the cell adhesion molecules is critical to transducing changes in the ECM to a change in the cell?
A. connexins B. cadherins C. integrins D. fibronectins E. claudins
Which of the following is least likely to be a cause of extinction?
a. asteroid impact b. human activity c. adaptive radiation d. continental drift e. climate change
Why do cells need buffering agents?
a. to operate at a constant pH of 2.0 b. to help transfer electrons from one atom to another c. to minimize the changes in pH of their internal environment d. to increase the amount of OH- in their surroundings