A negative rate of increase, or a negative r, means that:
A) death rates have decreased. B) the population has a short generation time.
C) the population is shrinking. D) there is zero population growth.
Answer: C
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The CRP-cAMP complex binds the lactose operon when:
A. glucose levels and cAMP levels are high. B. glucose levels are high and cAMP levels are low. C. glucose levels are low and cAMP levels are high. D. glucose levels and cAMP levels are low. E. None of these choices are correct.
Pertussis (whooping cough) is an epidemic disease that is a highly contagious, acute infection of the upper respiratory tract caused by the:
a. Brucella spp. b. Bordetella spp. c. Pasteurella spp. d. Francisella spp.
The passage from the mouth to the anus is termed the
A. gut canal. B. oral cavity. C. grand canal. D. gastrointestinal tract.
Scientists measured the pressure in the xylem of redwood trees at different heights and found that the higher they made their measurements, the lower the pressure. They extrapolated this to a pressure of zero, and concluded that the tallest a tree could grow is 122–130 meters. The tallest known tree on Earth is 112.7 meters. Which of the following most likely limits the height of trees?
A. amount of transpiration in leaves B. ability to take up CO2 C. strength of water cohesion D. amount of energy needed to pump water to the tops of the trees E. amount of photosynthesis in leaves