Free-floating, photosynthetic, unicellular protists include
A) phytoplankton.
B) ciliates.
C) cyanobacteria.
D) amoebas.
E) brown algae.
A
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The genomes of closely related species are more similar than distantly related species because _____
a. the less time since the species diverged, the more lethal DNA mutations will accumulate b. the more time since the species diverged, the more neutral DNA mutations will accumulate c. the less time since the species diverged, the more neutral DNA mutations will accumulate d. the more time since the species converged, the fewer adaptive DNA mutations will accumulate e. all organisms will accumulate lethal DNA mutations at the same rate
Within a landscape mosaic, patches
A) are composed of relatively heterogeneous communities. B) typically lack a distinct boundary. C) tend to be similar in size. D) tend to vary in shape.
A plant's tendency to grow toward a source of light is called
A) phototropism. B) lumitropism. C) gravitropism. D) amylotropism. E) thigmotropism.
Muscular dystrophy is caused by a mutation in dystrophin, and intracellular protein that binds to the cytoskeleton. Dystrophin also binds to ________, which is found in the plasma membrane of the cell and binds the extracellular matrix.
A. an actin filament B. a tight junction C. an integrin D. a cadherin E. a gap junction