If an organism produces beta-lactamase, which of the following antimicrobials would not be considered a drug of choice?
A) erythromycin
B) vancomycin
C) tetracycline
D) penicillin
Ans: D) penicillin
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In a pond, tadpoles eat algae and fish eat the tadpoles. Above the pond, grasshoppers eat grass and, at night, are preyed upon by bats. Other bats eat the fish that eat the tadpoles. In this community, the fish-eating bats are:
A. primary producers. B. primary consumers. C. secondary consumers. D. tertiary consumers. E. detritivores.
When a person is tested for HIV, the test is considered positive if _______ to the HIV are present.
A. bacteria B. antigens C. antibodies D. T-cells E. natural killer cells
What developmental event was key to the evolution of the chordates, by forming the notochord and dorsal nerve cord?
A. morphogenesis B. organogenesis C. gastrulation D. neural crest formation E. neurulation
A pair of cells that surrounds each stoma and controls its opening and closing are the
A. companion cells. B. guard cells. C. sieve tube cells. D. pith cells. E. vascular cells.