Which of the following levels of organization are correctly arranged from smallest to largest?
a. tissue, organ, organ system
b. tissue, organ system, organ
c. organ system, organ, tissue
d. organ system, tissue, organ
e. organ, organ system, tissue
A
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Which is not a characteristic of spirochetes?
A. The cells stain gram-negative. B. The cells are always motile. C. All cells have a cell wall. D. The cells exhibit a helical shape. E. All are pathogenic.
Most organs respond to _____ and _____
a. hormones; physical stimulation b. environmental signals; hormones c. hormones; neuronal signals d. environmental signals; neuronal signals e. physical stimulation; neuronal signals
The earliest type of eukaryotic organism currently
known is a type of a. virus. b. bacterium. c. alga. d. animal-like protist. e. fungus.
Water-conducting cells that have a small diameter and tapered ends are called
A) vessel elements. B) tracheids. C) sieve-tube elements. D) collenchyma cells. E) companion cells.