Cells require a constant input of energy to
What will be an ideal response?
maintain their structure
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The virulence of this organism, which causes chancroid, is most likely attributed to:
a. proteases. b. capsular factors. c. hemolysins. d. catalase.
Which collection of species could form a pioneer community?
a. lichens and mosses b. grasses, wildflowers, and small herbs c. grasses and shrubs d. trees such as aspens, alders, cedars, and firs
Which of the following is a phagocyte that acts to alert the adaptive immune system of the presence of antigen in solid
tissue?
a. macrophages b. monocytes c. neutrophils d. dendritic cells e. eosinophils
What is the function of companion cells?
a. These cells provide metabolic support to vessel elements. b. These cells provide metabolic support to sieve elements. c. These cells provide metabolic support to tracheids. d. These cells prevent water from entering the endodermis. e. These cells control the opening and closing of stomata.