A swim bladder is a gas-filled sac that helps fish maintain buoyancy. The evolution of the swim bladder from lungs of an ancestral fish is an example of _____
A) exaptation
B) changes in Hox gene expression
C) paedomorphosis
D) adaptive radiation
A
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Terrestrial plants must maintain a balance between the need for CO2 and the need to avoid desiccation. One response to these conflicting forces is that ___________________
A. stomata close when photosynthesis causes internal CO2 levels to drop. B. stomata close when guard cells lose water. C. guard cells shrink from water loss, causing stomata to open. D. stomata open in response to O2 buildup. E. water is actively transported into the guard cells, causing stomata to close.
The existence of MZ twin pairs in which only one has autism suggests that
A) some MZ twins are really dizygotic. B) the environment contributes to autism. C) twins cannot become autistic. D) genes do not contribute to causing autism.
Structural isomers differ from each other
a. in the arrangement of their covalent bonds. b. in their molecular formulas. c. by being mirror images of each other that cannot be superimposed on each other. d. by having double covalent bonds instead of single bonds. e. by having different atomic isotopes in their molecules.
What avenues of research would probably not help determine if asexual organisms form species?
a. determine if a cluster of bacteria constitutes a species b. explore various niches in which different populations reside c. look into previously undiscovered types of bacteria d. genomic research e. hybridizing polyploid plants