Which of the following is the best description of the form of an exoskeleton?
a. spines extending from the surface
b. plates under the skin
c. hollow, rigid tubes
d. interior columns
e. fluid-filled bags
C; Exoskeletons surround the torso and limbs of the organisms that have them. Spines, plate, and columns (choices a, b, and d) are all features of various kinds of endoskeletons, and the fluid-filled bags (choice e) are examples of hydroskeletons.
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The complement system functions to ____ and ____
a. mobilize B cells; initiate antibody production b. help the innate immune system; turn on expression of T-cell receptor protein genes c. destroy invading cells; provide a physical barrier against pathogens d. destroy invading cells; guide phagocytes to the infection site e. destroy viruses; guide phagocytes to the site of inflammation
The horizontal stems of seagrasses are called:
a. rhizoids. b. rhizomes. c. stipes. d. blades. e. holdfasts.
Spongiform encephalopathies are
A. associated with abnormal, transmissible, protein in the brain. B. caused by prions. C. chronic, fatal infections of the nervous system. D. Creutzfeldt-Jacob disease, kuru, and Gertsmann-Straussler-Scheinker syndrome. E. All of the choices are correct.
Zooxanthellae are photosynthetic algae living within the tissues of reef-forming corals
Indicate whether the statement is true or false