Huntington disease is _____
a. a model of a multifactorial trait, controlled by several genes
b. inherited as an X-linked dominant trait
c. a disease with onset in early childhood
d. one that produces no significant changes in brain cells
e. a model of a single gene defect affecting behavior
e
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The procedure developed by the Chinese to protect against smallpox was called
A. Oriental poxination. B. humoral immunity. C. variolation. D. naturally acquired immunity.
In land plants, what is the waterproof covering on the leaves and stems called?
a. stomata b. stroma c. cuticle d. pellicle
The bicuspid (mitral) valve is located between the
a. left and right atria. b. right atrium and right ventricle. c. left and right ventricles. d. left atrium and left ventricle. e. left ventricle and the aorta.
In a human cell at prophase I, there are ____ tetrads
a. 92 b. 46 c. 23 d. 2 e. 4