What cells are the precursors of macrophages?
A. B cells
B. macrophages
C. plasma cells
D. T cells
E. monocytes
E. monocytes
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In a particular layer of rock, a number fossilized ferns are found, but no fossilized mosses are found. What conclusions can be drawn from this finding?
A. The soft tissues of mosses may not have fossilized as readily as the lignified tissues of ferns, so it is difficult to draw any conclusions from this limited sample. B. Mosses and ferns did not coexist in the same environment. C. There are fewer species of moss than ferns. D. Ferns evolved earlier than mosses, so it is not surprising to find a layer with only ferns and no mosses. E. Ferns decompose more rapidly than mosses and thus are more likely to fossilize.
The bulk of a leaf consists of mesophyll, which is photosynthetic ____ with air spaces between cells
a. collenchyma b. parenchyma c. sclerenchyma d. phloem e. xylem
Which of the following best describes the mental processes that involve memory and an ability to reorganize information?
A. instinctive behavior B. thinking C. imprinting D. conditioned response
Which of the following genera fix nitrogen nonsymbiotically?
A. Rhizobium B. Nitrosomonas C. Azotobacter D. Nitrobacter