More than 40% of the 595 sites of imminent extinction are ____
a. completely protected
b. already developed
c. unprotected
d. of large size
e. of small size
ANSWER: c
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An agriculturalist is very concerned because his wheat crop is suddenly covered with red streaks. When consulted, you identify the issue as a condition known as rust. What would you advise the agriculturalist is the best preventive strategy for addressing the cellular basis of the rust?
A. Rust is caused by fungi that give a reddish cast to soils in which they grow, which is taken up by the plant. Treat the soil to prevent the uptake of the rust-causing fungi. B. Rust is caused by fungi that have reddish spores that emerge from the leaves of infected plants. Treat the plant to eliminate the fungi that causes the rust. C. Rust is caused by fungi that have enzymes for breaking down plant structure. Treat the plant to make it resistant to the enzymes that are causing the rust. D. Rust is caused by rust-colored mushrooms produced as fruiting bodies. Treat the plant to eliminate the fruiting bodies that are recognized as rust.
Cells active in secreting enzymes would likely exhibit a greater amount of ____ than other cells
a. exocytosis b. osmosis c. endocytosis d. receptor proteins e. plasma membrane
If the death rate of a population exceeds the birth rate of a population, ____
a. the growth rate will remain static b. the population will grow c. the environment will become overexploited d. an exponential growth curve will result e. the population will decrease in size
Interspecific hybrids differ from intraspecific hybrids in that
A. interspecific hybrids are common and intraspecific hybrids are rare. B. interspecific hybrids are fertile and intraspecific hybrids are not. C. interspecific hybrids can introduce new genetic material to a population and intraspecific hybrids cannot. D. None of the choices is correct.