Which proteins are encoded by genes that code for the first mRNAs transcribed in Drosophila embryos?
A. gap and pair-rule proteins
B. dorsal proteins
C. bicoid and nanos proteins
D. caudal and hunchback proteins
E. morphogen proteins
C. bicoid and nanos proteins
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To prevent disastrous consequences, the eukaryotic cell cycle is controlled by:
a. the mitochondria. b. replication. c. environmental signals. d. a very detailed, rigid genetic program. e. a series of cell cycle checkpoints
What type of immunity results from recovery from mumps?
A) innate immunity B) naturally acquired active immunity C) naturally acquired passive immunity D) artificially acquired active immunity E) artificially acquired passive immunity
Natural selection ________.
A) results in evolutionary adaptation B) is a very rare phenomenon C) does not affect allelic frequencies D) prepares organisms for future changes in the environment
The term mixotroph indicates that an organism __________.
a. can be both photoautotrophic and autotrophic b. can be both parasitic and free-living c. can be both heterotrophic and autotrophic d. has both unicellular and multicellular parts of its life cycle e. has both bacterial and archaeal features as a result of endosymbiosis