The heart rate decreases in response to the arrival of _____

A) acetylcholine
B) endorphin
C) nitric oxide
D) gamma-aminobutyric acid (GABA)


A

Biology & Microbiology

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Chronic myelogenous leukemia (CML) is caused when a segment of chromosome 9 and a segment of chromosome 22 both break off and switch places. How is this mutation classified?

A. deletion B. duplication C. inversion D. translocation E. reciprocal translocation

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Beta interferon is used to treat

a. herpes infections. b. multiple sclerosis. c. measles. d. mumps. e. hepatitis C.

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For which species concept is anatomical features the primary criterion for determining species identities?

1. biological 2. ecological 3. morphological 4. phylogenetic a. 2 only b. 4 only c. 1 only d. 1 and 2 e. 3 only

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In a karyotype of a male, which of the following would indicate an abnormality?

a. one X chromosome and one Y chromosome b. three copies of chromosome 22 c. 22 pairs of autosomes d. a total of 46 chromosomes

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