The female reproductive whorl of a flower typically consists of one or more ____
a. petals
b. carpels
c. stamens
d. receptacles
e. sepals
ANSWER: b
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Viruses that become established as stable parts of the host cell genome are called
A. lethal. B. potent. C. temperate. D. virulent.
The Kuna tribe, which inhabits islands off the coast of Panama, has almost no incidence of heart disease due to ____
a. the unusually large amount of cocoa they consume b. the unusually small amount of red wine they consume c. the unusually large amount of coffee they consume d. the absence of disease-carrying mosquitoes on the islands e. an allele that is unique to their tribe
When nitrate is reduced to dinitrogen gas (N2), nitrogen is removed from the ecosystem and returned to the atmosphere through a series of reactions collectively known as ________.
A. nitrogen fixation B. anammox reaction C. denitrification D. All of the choices are correct.
People who wash their hands frequently during cold season typically have fewer colds than those who do not. This observation suggests cold viruses can be transmitted by
A) fomites. B) mechanical vectors. C) biological vectors. D) direct contact. E) both direct contact and fomites.