Tranquilizers such as Xanax and Valium alleviate anxiety by enhancing effects of which neurotransmitter?

A. Serotonin
B. GABA
C. Dopamine
D. Norepinephrine
E. Epinephrine


Answer: B

Biology & Microbiology

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The above map shows

A) principal maquiladora centers. B) the world's principal EPZs. C) offshore financial centers. D) headquarters of principal TNCs. E) the world's principal NICs.

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Answer the question using the accompanying figure. Which branch of this phylogenetic tree identifies the common

ancestor of all modern organisms?

a. A b. B c. C d. D e. E

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Most of the lymph fluid is returned to the bloodstream through the thoracic duct to the

A. left atrium of the heart. B. right atrium of the heart. C. right ventricle of the heart. D. left subclavian vein. E. right subclavian vein.

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Once we have used character data to infer a tree, how can we be certain this tree is correct?

a. We can't; we can only estimate a ‘best fit.' b. We can test statistical confidence that the tree or some portion of it is correct. c. In most cases, we can ascertain whether our tree is correct with 95% confidence. d. All of the above. e. None of the above.

Biology & Microbiology