A Drosophila larva that develops from an oocyte that has no bicoid mRNA will have what developmental defect?
A. only ventral structures
B. no dorsal structures
C. only anterior structures
D. only posterior structures
D
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The ____ in the mammalian airway acts as the "windpipe"
a. bronchus b. trachea c. larynx d. bronchiole e. pharynx
Eutrophication
A. causes massive die-off of fish and invertebrates. B. is characterized by heavy surface algal blooms. C. occurs when there are excess nutrients in aquatic ecosystems. D. restricts the O2 supply to water below the surface. E. All of the choices are correct.
The molecular fragment (the G, U and A’s) represented in the accompanying figure is:
a. ATP.
b. RNA.
c. DNA.
d. a nucleotide.
e. a polysaccharide.
The divergence between the two populations of Rhagoletis must have occurred very rapidly because
A) The apple tree was imported into North America with European settlement approximately 200 years ago B) Flies were imported into North America with European settlement approximately 200 years ago. C) Long-distance rail transport of fruit increased only after the American Civil War D) Heavy use of gunpowder during the American Civil War led to increased mutation rates in many natural populations of plants and animals.