Before cells divide into two daughter cells, it must first duplicate its
A. entire genome.
B. array of enzymes.
C. cell membrane structure.
D. cytoplasmic contents.
E. All of the answer choices are correct.
A. entire genome.
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The major histocompatibility complex directs the production of proteins called
A. class IV. B. class II. C. class I. D. both class I and class II. E. both class I and class IV.
Plants lacking well-developed conducting systems such as mosses, liverworts, and hornworts have been called
A. gametophytes. B. sporophytes. C. angiosperms. D. gymnosperms. E. bryophytes.
Plant hormones generally ____ concentrations to be effective, and usually have ____ on different plant tissues
a. are effective only in extremely large; the same effect b. require only low; different effects c. require only low; the same effect d. are effective only in extremely large; different effects e. require moderate; the same effect
Anti-human antibodies (specific for human IgG antibodies) with fluorescent molecules covalently attached are used for
A) direct fluorescent antibody tests. B) indirect fluorescent antibody tests. C) direct ELISAs. D) indirect ELISAs. E) immunodiffusion tests.