If its cells are striated and abut at the ends so that the cells contract as a unit, the tissue is
a. smooth muscle.
b. dense fibrous connective.
c. supportive connective.
d. cardiac muscle.
e. hyaline cartilage.
D
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In a two-dimensional gel electrophoresis experiment, proteins are separated horizontally by ____
A. amino acid sequence B. molecular mass C. abundance D. isoelectric point
Ivan Valiela's hypothesis that the growth of salt marsh grass is limited by nitrogen availability was:
a. disproved by the growth of larger and taller grass in his control (nitrogen-fertilized) plots. b. disproved by the growth of larger and taller grass in his experimental (nitrogen-fertilized) plots. c. supported by the growth of larger and taller grass in his experimental (nitrogen-fertilized) plots. d. supported by the growth of larger and taller grass in his control (nitrogen-fertilized) plots. e. unsupported by a poor experimental design.
Populations with higher genetic diversity _____________
A. are vulnerable to environmental change B. may suffer inbreeding depression C. include the cheetah and the American bison D. are better able to evolve when faced with environmental change E. All of the above are correct.
The fungi that cause serious plant disease, such as Dutch elm disease and chestnut blight, belong to the phylum
A. Zygomycota. B. Imperfect fungi. C. Ascomycota. D. Basidiomycota. E. Actinomycetes.