The basic excretory unit in the protonephridia of flatworms is a:
A. scolex
B. flame cell
C. cnidocil
D. ganglion
E. cercaria
B. flame cell
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The region in a tRNA that bonds with mRNA during translation is the ____
a. anticodon b. aminoacylation site c. TATA box d. cloverleaf e. reading frame
A muscle contraction where fibers cannot relax at all between stimuli is called
a. an action potential. b. a muscle twitch. c. fatigue. d. tetanus. e. constriction.
Growth of a forest in an abandoned corn field is an example of _____
a. primary succession c. secondary succession b. resource partitioning d. competitive exclusion
Which of the following is NOT a unique
angiosperm adaptation that allowed them to outcompete gymnosperms to become the dominant land plants?
a. they grow faster than gymnosperms b. pollination is assisted by insects and other animals c. animals assisted in seed dispersal by consuming their fruits d. angiosperms have non-flagellated sperm and thus can reproduce in dry areas e. more than one of these is NOT a unique angiosperm adaptation that allowed them to become the dominant land plants Chapter Fourteen 233