In a comparison of birds and mammals, having four limbs is _____
A) a shared ancestral character
B) a shared derived character
C) a character useful for distinguishing birds from mammals
D) an example of analogy rather than homology
A
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Which of the following characteristics does NOT distinguish the archaea from the bacteria?
A) the types of transfer RNA used B) the rRNA sequences present C) the deoxyribonucleotides D) cell wall composition E) cell membrane composition
The individual credited with the initial description of endospores (as being highly heat resistant microbes) is
A) Robert Koch. B) John Tyndall. C) Louis Pasteur. D) Carl von Linnaeus.
Which of the following statements pertaining to changes in the global economy of the 21st century is true?
A) Barriers to the free flow of goods, services, and capital have increased B) volume of global output has been growing more rapidly than cross-border trade and investment C) National economies are becoming more independent D) the world is moving toward an economic system that is more favorable for international business
Which of the following is probably the main factor responsible for the phenomenon of density-dependent inhibition?
A) a local accumulation of growth-inhibiting factors B) cells' innate ability to "sense" when the organ of which they are a part has no need for additional cells C) a local deficiency of nutrients D) physical contact of cell-surface proteins between adjacent cells