What cyanobacterium is responsible for producing harmful toxins that create health risks for populations living and harvesting shellfish in contaminated areas where these toxins are released?
a. Anabena
b. Microcysts
c. Chlorobi
d. Spirulina
e. Synechoccocus
Ans: b. Microcysts
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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 algae are:
A. primary producers. B. primary consumers. C. secondary consumers. D. tertiary consumers. E. detritivores.
Campylobacter spp. can sometimes be detected by direct Gram-stain examination of fecal sample, which would reveal many:
a. large, faintly staining gram-negative ba-cilli. b. small curved or seagull-winged gram-negative bacilli. c. small gram-negative coccobacilli. d. plump, faintly staining gram-negative ba-cilli.
The phylum ____ consists of about 200 known species of nonvascular plants that produce hornlike sporophytes, and
are the only land plants whose chloroplasts contain alga-like protein bodies called pyrenoids.
a. Hepatophyta b. Monilophyta c. Bryophyta d. Lycophyta e. Anthocerophyta
As a tissue, blood is composed of only one type of cell
a. True b. False