Briefly describe the shift in rainfall patterns and the consequences that occurred during the 1997-1998 El Niño season. What will be an ideal response?
ANSWER: Rainfall patterns shifted during an El Niño. During the winter of 1997–1998, torrential rains
caused flooding and landslides along eastern Pacific coasts, while Australia and Indonesia
suffered from drought-driven crop failures and raging wildfires.
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The per capita growth rate (r) is ____ per
mouse per month in a population of 1,000 mice where 500 mice are born and 400 mice die monthly. a. 0.1 b. 0.2 c. 0.3 d. 0.4 e. 0.5
If nondisjunction occurs during meiosis II (to one of the cells resulting from meiosis I), how many of the final four products will be abnormal?
A. none B. three C. two D. four E. one
Kin selection helps make predictions about which of the following phenomena in nature:
a) when helpers-at-the-nest should occur and which individuals the helpers should assist. b) eusociality among ants, bees, and wasps. c) bequests made by humans in their wills. d) a) and b) only. e) a), b), and c) are all correct.
How is a gradient of H+ ions formed across the inner mitochondrial membrane?
A. ATP synthase generates a H+ gradient across the inner mitochondrial membrane. B. Electrons move from NADH to a chain of proteins with lower electronegativities. C. The electron transport chain uses ATP to pump H+ across the inner mitochondria membrane against its electrochemical gradient. D. The electron transport chain uses energy from transfer of an electron donated by NADH to pump H+ across the inner mitochondrial membrane against its electrochemical gradient. E. The electron transport chain of proteins contains pores that are leaky to H+.