The release of _____ ions from the sarcoplasmic reticulum is required for skeletal muscle contraction.
A. sodium
B. phosphate
C. potassium
D. chloride
E. calcium
Answer: E. calcium
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An animal that maintains its body temperature by using heat generated from its own metabolism is a(n)
A. amniote. B. thermophile. C. endotherm. D. ectotherm. E. mesophile.
The introduction of a small population onto an island that results in a different gene pool from the
original source is explained by a. the Hardy-Weinberg law. b. genetic drift. c. the bottleneck effect. d. the founder effect. e. the effect of genetic isolation.
The most common cancer in woman is cancer of the ____
a. blood b. skin c. colon d. lung e. breast
Parental care in dinosaurs, crocodiles, and birds is an example of
A. homology caused by convergence. B. homoplasy caused by common descent. C. homoplasy caused by convergence. D. homoplasy caused by evolutionary reversal. E. homology caused by common descent.