What does the accompanying figure represent?
a. an acid and a base
b. two different ions
c. a cation and an anion
d. two different elements
e. two isotopes of the same element
e
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The sequences found in a mature eukaryotic mRNAs are
A) extremes. B) exons. C) inclusions. D) introns. E) spliceosomes.
Most adolescents begin smoking
a. because of its stimulatory effects. b. because it makes them look sophisticated. c. due to the influence of celebrities. d. to defy their parents. e. as a result of social pressures.
The appearance of __________ marks the onset of
gastrulation in humans. a. a notochord b. the primitive streak c. mesoderm d. neural folds e. somites
A structural molecule found in eukaryotic cytoskeletons, but NOT flagella, cilia, and centrioles is (actin/flagellin/tubulin).
Fill in the blank(s) with the appropriate word(s).