If you had a friend with a peptic ulcer, would you recommend that he or she take aspirin for the pain? Why or why not?
What will be an ideal response?
No. Aspirin blocks the production of prostaglandins, a type of chemical that helps protect the digestive system's lining from acid attack. Without the prostaglandins, the lining of the stomach would be even more susceptible to damage.
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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.
You are studying a population of beetles of size N = 3000. During a one-month period, you record 400 births and 150 deaths. Considering the estimate of r from these data, project the population size in 6 months
A. 2.5 × e14 B. 4500 C. 4945 D. 2160
Much of the loss of biologically available nitrogen in the ocean is now thought to be due to a consortium of microbes carrying out ________.
A. denitrification B. the anammox reaction C. nitrogen fixation D. nitrification
ribosomes
What will be an ideal response?