A distinctive feature of cells in multicellular organisms is their specialization as a result of ______.
A) differentiation
B) replacement
C) conversion
D) homeostasis
Ans: A) differentiation
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In a solution at pH 7.0, a polymer of lysine (polylysine) is a random coil with no secondary structure. In order for it to possibly assume an ?-helix structure, the pH of the solution must be:
A. 4 B 6 C. 8 D. 10 E. 12
Average height of college students increased throughout the 20th century because
A) more students attended college. B) more short students went into military service instead of college. C) nutrition improved greatly in that time. D) many mutations conferring great height occurred during that time period.
Unrelated species living in geographically separated parts of a biome may resemble one another as a result of
a. competitive interactions b. morphological convergence c. morphological divergence d. coevolution
On which surface of an epithelial cell are microvilli located?