Which of the following describes the radula found in mollusks?
a. a tongue-like scraping organ
b. a hard, shell-like epidermis
c. a specialized set of gills
d. an opening in the pharynx
a. a tongue-like scraping organ
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Retroviruses have a unique enzyme that
A. disintegrates host DNA. B. polymerizes host DNA. C. transcribes viral RNA to cDNA. D. translates host DNA. E. repairs viral DNA.
The circulatory and lymphatic systems both serve major transport functions in the body, with contents of the lymphatic system essentially derived from the circulatory system
Indicate whether the statement is true or false
The logistic growth rate of a population is best represented by the equation
a) N[(K-N)/K] b) rN[(K-N)/K] c) [(K-N)/K] d) rN(K-N) e) r[(K-N)/K]
Cassiopeia is a marine organism with a medusa body that has an unusual orientation: It floats upside-down. It also has a distinct coloration that is due to algae that live between the epidermis (outer) layer and gastrodermis (inner layer that lines the
digestive cavity) of the Cassiopeia. The algae provide food for the Cassiopeia, and the Cassiopeia's orientation provides sunlight to the algae for photosynthesis. Cassiopeia is a/an ________, and the Cassiopeia and the algae have a ________ relationship. A) mollusc; predatory B) arthropod; symbiotic C) cnidarian; symbiotic D) echinoderm; symbiotic