Humans become infected with tapeworms by ________
a. having sexual intercourse with infected people
b. wading in water that is infested with Schistosoma larvae
c. drinking untreated water directly from ponds or streams
d. eating undercooked beef or fish that contain encysted larvae
d
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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.
Ricin is toxic because it
a. binds to eukaryotic DNA. b. binds to eukaryotic mRNA. c. blocks food from entering the cell. d. inactivates ribosomes. e. binds to nerve tissue and causes paralysis.
The validity of scientific discoveries is not
based on a. morality. b. aesthetics. c. philosophy. d. economics. e. any of these.
Which organelle often takes up much of the volume of a plant cell?
A) lysosome B) vacuole C) Golgi apparatus D) peroxisome