Which one of the following incorrectly matches a molluscan group with a feature characterizing that group?  

A.  Gastropoda—torsion
B.  Nudibranchs—extensive gills in mantle cavity
C.  Bivalvia—reduced head and no radula
D.  Polyplacophora—eight calcareous plates
E.  Cephalopoda—closed circulatory system


B.  Nudibranchs—extensive gills in mantle cavity

Biology & Microbiology

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__________ are animals with a backbone. Fill in the blank(s) with the appropriate word(s)

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During gamete formation at the end of telophase I, the ploidy of the daughter cells is ________, and each chromosome consists of ________ chromatid(s)

Fill in the blank(s) with correct word

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Microbes and humans have evolved a variety of ________ relationships, including ________ where microbes help the host

A) dynamic; commensalism B) symbiotic; mutualism C) commensal; mutualism D) symbiotic; commensalism E) symbiotic; parasitism

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Spores can undergo _____ to become a vegetative cell. Vegetative cells go through _____ to become a spore.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology