The heart rate decreases in response to the arrival of _____
A) acetylcholine
B) endorphin
C) nitric oxide
D) gamma-aminobutyric acid (GABA)
A
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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
Beta interferon is used to treat
a. herpes infections. b. multiple sclerosis. c. measles. d. mumps. e. hepatitis C.
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
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