One of the main functions of the _____ is the production of the female reproductive cells.
A. hymen
B. breasts
C. vagina
D. ovaries
D. ovaries
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Why did the H1N1 strain of influenza virus cause a pandemic in 2009?
A) The H1N1 virus had a mutation that increased the mortality associated with infection. B) The H1N1 virus had a mutation that increased the basic reproduction number of the virus. C) The H1N1 virus underwent a significant antigenic shift compared to other circulating strains of influenza. D) The H1N1 virus acquired a new gene from pigs that resulted in increased virulence.
Which of the following processes is responsible for the changes scientists observed in atmospheric concentrations of 12C, 13C and 14C?
A. the burning of fossil fuels B. volcanism C. the clearing of forests D. chemical weathering E. subduction
Biological magnification is best defined as ____
a. the increase in toxicity of a chemical compound resulting from its metabolism by a living organism b. the higher relative proportion of biomass among producers as compared to consumers in an ecosystem c. the concentration of nondegradable poisons within organisms at higher trophic levels d. the concentration of degradable poisons within organisms at lower trophic levels e. the declining relative proportion of nondegradable poisons in organisms at higher trophic levels as compared to those at lower trophic levels
Before an animal cell’s membrane fuses with a virus, the virus must first:a
duplicate its DNA. b. use enzymes of the plasma membrane to break down its capsid. c. replicate itself to attack numerous sites of the plasma membrane. d. extend its tail fibers to sense the plasma membrane of the host cell. e. attach to a specific receptor on the plasma membrane of the host cell.