If two otherwise dissimilar organisms share similar genomic DNA, it suggests which of the following conclusions?
A. The shared genes are ancient and probably no longer function within the altered physiological states of modern organisms.
B. The shared genes have evolved a number of times and have no phylogenetic significance.
C. The two taxa are more closely related than formerly believed.
D. The shared genes developed early in evolution and are likely to be applicable to a wide diversity of organisms.
E. DNA is not a reliable basis for phylogenetic decisions.
C. The two taxa are more closely related than formerly believed.
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The greatest rate of extinction of all time is/was probably caused by ____
a. an ice age b. unknown reasons c. formation of Pangea d. human activity e. asteroid impact
What happens immediately following the closing of the sodium gates during an action potential?
a. Sodium ions enter the cell. b. Sodium ions leave the cell. c. Potassium ions enter the cell. d. Potassium ions leave the cell. e. Calcium ions leave the cell.
In all sexually reproducing organisms, the diploid phase of the life cycle begins at
a. spore formation. b. gamete formation. c. meiosis. d. mitosis. e. fertilization.
Before the modern era of science, organisms were assigned to species on the basis of
A) the existence of fossils of earlier forms. B) geographic location. C) similarities in appearance. D) behavioral similarities. E) their capability of interbreeding.