Which type of microscope is the most widely used and shows cells against a bright background?
A. bright-field
B. dark-field
C. phase-contrast
D. fluorescence
E. electron
A. Bright Field
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Although Desulfotomaculum species stain Gram- ________ , these bacteria possess a cell wall more closely related to Gram- ________ bacteria and are correctly placed in the low 
Firmicutes.
Fill in the blank(s) with the appropriate word(s).
The leading cause of current species extinctions is
A) global warming. B) habitat destruction. C) hunting. D) diseases.
Legumes secrete ____ to attract rhizobial bacteria in low nitrogen soils
a. cytokin b. flavonoids c. nod factors d. calcium e. water
The floating assemblage of microbes, plants, and animals that drifts on or near the surface of large bodies of water is the _______ community.
a) Abyssal b) Benthic c) Littoral d) Plankton