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
A. ctenidia—secretion of the shell (when present)
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The decrease or loss of virulence of a pathogen is referred to as
A) aging. B) attenuation. C) disinfectivity. D) lethal dose.
Two pure-breeding phlox plants were crossed, one with dark-blue flowers and the other with pink flowers. The F1 generation all had dark-blue flowers. When the F1 were crossed with each other, the F2 generation consisted of 176 plants: 101 with dark-blue flowers, 33 with light-blue flowers, 30 with red flowers, and 10 with pink flowers. How is flower color controlled in phlox?
A) one gene with four alleles B) one gene with two codominant alleles C) two genes whose alleles interact additively D) two genes with dominant epistasis
Which of the following is believed to be a potential result of unchecked population growth?
a. increasing inequalities in food access b. increasing enforcement of one-child policies c. inability to predict population carrying capacities d. decreasing proportion of older individuals in populations
The volume of air remaining in the lungs following a maximum expiration is called
A) residual volume. B) tidal volume. C) inspiratory reserve volume. D) inspiratory capacity. E) vital capacity.