Molecular data shows that land plants and charophytes
A. are in the same clade and form a monophyletic group.
B. are in different clades but form a monophyletic group.
C. do not share common ancestry.
D. are in different clades and form a polyphyletic group.
E. are in the same clade but form a polyphyletic group.
Answer: A
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In most eumetazoans, the muscles of the body wall are derived mainly from which embryonic cell layer?
a. mesoderm b. epiderm c. mesoglea d. endoderm e. ectoderm
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In precipitation tests, maximum precipitation takes place when
A. the amount of the antibody exceeds the amount of the antigen. B. the amount of the antigen exceeds the amount of the antibody. C. the amount of the antibody and the amount of the antigen are at optimal proportions. D. a toxin is present. E. a complex solution of many antibodies is used.