Consider these five infectious diseases: Ebola hemorrhagic fever, avian influenza, SARS, West Nile encephalitis, and mad cow disease. Which of the following features is shared by this group of diseases?
A) These diseases are considered to be emerging infectious diseases
B) These diseases all have nonliving reservoirs
C) These diseases are all transmitted by arthropod vectors
D) These diseases are all caused by viruses
Ans: A) These diseases are considered to be emerging infectious diseases
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What structure best represents a polymer?
A. A fatty acid. B. A monosaccharide. C. A nucleotide. D. An amino acid. E. A protein.
What evolutionary advantage do flowers provide to angiosperms?
a. They metabolize sunlight faster than in plants without flowers. b. They prevented predation by herbivores, as their bright colors served as a warning to keep away. c. They developed a cooperative evolutionary relationship with pollinators, which delivered pollen to female gametophytes more directly. d. They provided shade and protection from sunlight in hot climates.
An asteroid impact on Earth is often associated with the formation of ____
a. large floods b. erupting volcanoes c. magnetized rock d. fossils e. shocked quartz
________ inheritance is a phenomenon in which two or more genes contribute to a single phenotypic trait.
Fill in the blank(s) with the appropriate word(s).