Public health scientists discover and become concerned about a new strain of RNA virus among farm animals, especially geese and pigs, in the Midwest. Each virion is composed of lipid, helical proteins, and multiple pieces of RNA. This new virus may be a(n)
A. rotavirus.
B. influenza virus.
C. hantavirus.
D. dengue virus.
E. coronavirus.
Answer: B
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The cell wall ____
a. provides physical support for plant cells b. controls the transport of materials out of the cell c. replaces the plasma membrane in plant cells d. is found in all eukaryotes e. prevents the transport of toxic substances into the plant cells
The reason that approximately one-third of adults in the United States will suffer significant hearing
loss by age 65 is most likely a. frequent infections. b. inborn structural problems. c. head trauma. d. excessive noise. e. unknown causes.
The hair cells of the inner ear begin to suffer damage when exposed to sounds louder than
a. 35?45 decibels. b. 45?55 decibels. c. 55?65 decibels. d. 65?75 decibels. e. 75?85 decibels.
Some MP3 players or iPods produce sounds over
a. 100 decibels. b. 130 decibels. c. 200 decibels. d. 250 decibels. e. 300 decibels.