The principal government agency responsible for tracking infectious diseases in the United States is the
A. United States Department of Agriculture.
B. World Health Organization.
C. National Institutes of Health.
D. Infection Control Committee.
E. Centers for Disease Control and Prevention.
Answer: E
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Molecular clocks are usually calibrated based on
A. guesses about the rates of mutations in a particular gene. B. observed rates of mutation in a particular gene. C. the first shared common ancestor for species known from the fossil record. D. comparing the gene to similar genes in other kingdoms. E. the date when two species diverged from a common ancestor.
The highest concentration of cones is in the
a. fovea. b. blind spot. c. sclera. d. iris. e. choroid.
Which pair of animals is probably most closely related evolutionarily?
A) animals in the same phyla B) animals in the same genus C) animals in the same family D) animals in the same class
Which grouping of elements is found in carbohydrates?
A. N - S - O B. Ca - H - O C. C - H - P D. C - H - O E. H - O - Cl