Human skin color is thought to be determined by at least three pairs of alleles. If dark skin (D) is dominant to light skin (d), the genotypes that will produce the darkest skin are
A. D1d1 D2d2 D3d3.
B. D1D1 D2d2 d3d3.
C. d1d1 D2D2 D3d3.
D. D1d1 D2d2 D3D3.
D. D1d1 D2d2 D3D3.
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Five species of ants can be found on aspen sunflowers (Helianthella quinquenervis), which live in wet mountain meadows of the Rocky Mountains. The aspen sunflowers provide nectar to the ants in special structures called extrafloral nectaries
The ants, in turn, protect the sunflowers from other insects. The ants, however, are not found solely on the sunflowers—they can be found tending aphids on other flower species and collecting nectar from other species as well. This, then, is an example of a(n): A. obligate mutualism B. obligate antagonism C. facultative mutualism D. facultative antagonism E. none of the answer options are correct.
Ras is to Raf, as MEK is to
A) Ras. B) tyrosine. C) MAPK. D) Cdc. E) cell growth.
Aminoacyl-tRNA synthetase is the enzyme that
A) folds tRNA molecules into their proper configuration. B) causes tRNA molecules to bind to the aminoacyl site of a ribosome. C) produces tRNA by reading DNA molecules. D) adds the appropriate amino acid to an uncharged tRNA.
How can one grass species be dominant one year, while another is dominant a few years later and then the first becomes dominant again?
A) changes in precipitation across years B) Lotka-Volterra models predicting cycling C) competitive exclusion principle D) growth rate differences among the species