Which of the following is considered an opportunistic pathogen?
A) Toxoplasma gondii
B) Trichomoniasis vaginalis
C) Candida albicans
D) Plasmodium vivax
Answer: C
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Soil mineral particles that are less than 0.002 mm in diameter are called
a. sand. b. humus. c. clay. d. silt. e. microparticles.
During which epoch does a major extinction event begin?
a. Eocene b. Oligocene c. Miocene d. Pleistocene e. Recent
Purple flower (A) is dominant over white flower (a), and tall stem (B) is dominant over short stem (b). The Punnett square
represents a cross between two dihybrids (AaBb ? AaBb). In the figure above, how many plants would have purple flowers and tall stems?
a. 1 b. 3 c. 5 d. 9 e. 16
A circulatory system that keeps blood confined within vessels after leaving the heart is
A. a closed circulatory system. B. a gastrovascular cavity. C. an open circulatory system. D. an incomplete circulatory system. E. a complete circulatory system.