Which of these structures is derived from an ancestral air-breathing lung in ray-finned fishes and is
used to increase buoyancy?
a. swim bladder
b. spiral valve
c. operculum
d. atrium
e. lateral-line system
A
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Which of the following statements about quorum sensing is FALSE? Quorum sensing _____
A) is cell-cell communication in eukaryotes B) is species specific C) may result in biofilm formation D) is particularly well studied because of its medical importance
Spiracles are located
a. at the insect body surface. b. all along the tracheal system. c. at the tissue end of a tracheal tube. d. at the cells in contact with the tracheal tubes. e. at the branch points along the tracheal system.
Homologous structures have evolved from the same structure in a common ____________.
Fill in the blank(s) with the appropriate word(s).
most cells of the pancreas produce digestive enzymes, not insulin
a. true b. false