Which structure 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
ANSWER: a
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A group of prokaryotic genes that are controlled together is a(n)
A. proteome. B. ribosome. C. replication fork. D. operon. E. chromosome.
An Rh-negative mother will need a special treatment if she gives birth to an Rh-positive baby. The treatment involves the destruction of any stray blood cells from the baby that pass into the mother's bloodstream. Why is this necessary?
A) The mother's immune system will attack the Rh-positive cells and produce antibodies that will attack a fetus in a subsequent pregnancy. B) The mother's immune system will attack her own blood cells and the cells in the fetus of a subsequent pregnancy. C) Without this treatment, the mother's immune system will attack only her own blood cells. D) Without this treatment, antibodies will be formed in breast milk, which could harm the baby.
What would be an expected feature of a plasma membrane that had no integral membrane proteins?
A. the membrane would have no fluidity B. the membrane would not associate with peripheral membrane proteins C. the membrane would have no cholesterol D. the membrane would be unable to transport sodium ions E. the membrane would collapse
Which of the following constitute the vestibular apparatus?
A. Saccule, utricle, and ventricle B. Saccule and utricle only C. Ampullae of Lorenzini D. Saccule, utricle, and Organ of Corti E. Semicircular canals, saccule, and utricle