How many alleles are there for the ABO blood group?
A. 1
B. 2
C. 3
D. 4
E. 6
Answer: C. 3
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The ultimate source of all energy in a terrestrial ecosystem is ____
a. the organic matter in all the organisms of the ecosystem b. electrons from water molecules c. sunlight d. ATP e. inorganic mineral ions in the soil
Which of the following cell types would not be found in connective tissue?
a. macrophages b. red blood cells c. chondrocytes d. pseudostratified cells e. adipose cells
A dark-field microscope differs from a bright-field microscope in that a dark-field microscope
A. illuminates a specimen with UV rather than visible light. B. converts the phase differences between light that does and light that does not pass through a specimen into differences in brightness. C. measures the infrared emission of light from a specimen. D. illuminates only the part of the specimen that is in focus, eliminating scattering of extraneous light from above and below the focal plane. E. None of these answers are correct
Swallow bugs cause nest failures and juvenile mortality. As colony size increases, the costs to cliff swallows are
a. increased juvenile mortality. b. decreased juvenile mortality. c. decrease in the number of unhatched eggs. d. a change in daily survival probability.