Tube feet of sea stars, erectile tissue of the penis in vertebrates, and the bodies of cnidarians are all supported by ____

a. an exoskeleton
b. cardiac muscle
c. a hydrostatic skeleton
d. an endoskeleton
e. joined exo- and endoskeletons


ANSWER: c

Biology & Microbiology

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The nucleotides within DNA are composed of a

A. phosphate group, ribose sugar, and nitrogenous base. B. sulfur group, ribose sugar, and nitrogenous base. C. phosphate group, deoxyribose sugar, and nitrogenous base. D. sulfur group, deoxyribose sugar, and nitrogenous base. E. phosphate group, hexose sugar, and nitrogenous base.

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The loss of function of the ____ renders fish unable to school

a. vestibular apparatus b. statocyst c. lateral line d. eyes e. saccule

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Which condition favors fossilization?

a. death in a dry area b. rapid decomposition c. a cartilaginous skeleton d. a bony skeleton e. death in an active geologic area

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During which stage of syphilis does fever, lymphadenopathy, and a red to brown rash occur?

A) Secondary B) All of these choices are correct C) Latent D) Tertiary E) Primary

Biology & Microbiology