Due to character displacement, two closely related species may differ most morphologically when they
A. occupy different niches.
B. share a common ancestor.
C. are sympatric.
D. occupy the same niche.
E. are allopatric.
Answer: C
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Which one of the following incorrectly matches a molluscan structure with its typical function?
A. ctenidia—secretion of the shell (when present) B. visceral mass—houses organs of digestion, excretion, reproduction C. foot—locomotion D. nephrostome—collection of nitrogenous wastes E. radula—feeding organ
Which of the following provided the selective pressures that most directly promoted the evolution of photosynthesis?
a. the drop in surface UV radiation caused by the formation of the ozone layer b. the depletion of dissolved organic material from the oceans c. the ability of some organisms to use oxygen to generate ATP during respiration d. an increase in visible light intensity at the surface of the Earth, caused by solar flares e. an increase in volcanic activity and release of CO2 into the atmosphere
Which neurons integrate information coming into and out of the central nervous system?
a. afferent neurons b. motor neurons c. interneurons d. efferent neurons e. sensory neurons
Koch's postulates were used to demonstrate the relationship between
A) HIV and AIDS. B) Mycobacterium leprae and leprosy. C) liver flukes and liver cancer. D) Haemophilus influenzae and Hib meningitis. E) Haemophilus influenzae and the flu.