A key step in the evolution of vascular plants was the ability to produce __________, a strengthening
polymer in the walls of cells that function in support and conduction.
a. lignin
b. cellulose
c. starch
d. fructose
e. cutin
A
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Cell shapes are largely determined by:
A. cytoskeletal protein networks in the cytoplasm. B. adhesion proteins that assemble at cell surfaces. C. a mesh of proteins and polysaccharides in the extracellular matrix. D. cytosolic proteins that assemble into structures called cellular junctions. E. All of these choices are correct.
If the frequency of a recessive allele is 36 percent,
the frequency of the dominant allele is what percent? a. 5 b. 8 c. 25 d. 48 e. 64
After his return to England, Darwin most pondered which question?
a. What could explain the great numbers and variety of species? b. Does the fossil evidence support uniformitarianism? c. Are the extinct and living armadillos the same species? d. Did Galápagos mockingbirds have a common mainland ancestor? e. Will natural selection work in England?
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