Which of the following is a primary lymphoid organ?
A. tonsils
B. spleen
C. lymph node
D. bone marrow
E. circulatory system
D. bone marrow
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Which of the following events do notoccur during spliceosome assembly on pre-mRNAs?
A. U1 snRNP binds to the 5' splice site. B. U2 snRNP binds to the branch point. C. U6 snRNP binds to the 3' splice site. D. U5 snRNP binds to the 5' splice site.
Which structure contains the angiosperm egg?
A. style B. endosperm C. anther D. embryo sac E. stigma
Which of the following habitats is most likely to be
rich in fossils? a. eroding hillsides b. deserts c. polar ice caps d. a bed of a former shallow sea e. rocky plateau
The wings of bats and birds and the flippers of porpoises are
a. analogous structures. b. totally unrelated. c. functionally different. d. homologous structures. e. similar by chance.