A horseshoe-shaped crown of tentacles used by many invertebrates for feeding is called a

A. protostome.
B. rhizophore.
C. trochophore.
D. lophophore.
E. fimbrium.


Answer: D

Biology & Microbiology

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During the light reaction water is oxidized to form oxygen. This process

A. yields low-energy electrons. B. yields high-energy electrons. C. is needed to replace the electron lost by P680 during the light reaction. D. yields low-energy electrons and is needed to replace the electron lost by P680 during the light reaction. E. yields high-energy electrons and is needed to replace the electron lost by P680 during the light reaction.

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If a daughter expresses an X-linked recessive gene,

she inherited the trait from a. her mother. b. her father. c. both parents. d. neither parent. e. her grandmother.

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All of the following were likely present on the primitive Earth during the evolution of self replicating molecules EXCEPT

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