Found mostly in marine environments, members of the ____ flatworm lineage are free-living,and acquire food with a
muscular pharynx; most are hermaphroditic.
a. Trematoda
b. Turbellaria
c. Polychaeta
d. Cestoda
e. Hirudinea
ANSWER: b
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The failure of sister chromatids to separate during meiosis is called
a. crossing-over. b. tetrad formation. c. disjunction. d. nondisjunction.
Amniocentesis is used mainly to obtain information about
A. an unborn child. B. the mother. C. the father. D. All of these answers are true.
When the concentration of glucose in the blood rises following the digestion of a meal, what is the hormonal response?
What will be an ideal response?
The RNA sequences of some introns found in bacteria, mitochondria, chloroplasts, and some nuclear genes fold into 3-D structures that catalyze the removal of the introns. Therefore, the intron functions as a
A. spliceosome. B. scaffold. C. ribozyme. D. guide. E. enzyme.