What is the most likely consequence of a mutation that causes sporopollenin to degrade quickly after it is synthesized?
A. a decrease in the number of sperm that can be produced
B. a reduction in the ability of pollinators to detect and transfer pollen grains to a stigma
C. a decrease in the ability of the pollen grain or spore to open when a suitable location is found
D. a reduction in the ability of the integument of an ovule to develop into a seed coat
E. a reduction in the ability of pollen and spores to disperse to new areas
Answer: E
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Which circumstance violates the conditions of the Hardy—Weinberg model?
a. the population is infinitely large b. the population is closed to migration from other populations c. no mutations are occurring d. all genotypes in the population survive and reproduce equally well e. nonrandom mating with respect to genotypes occurs between individuals
Which of the following did Nam-Hai Chua and his colleagues demonstrate to be part of the abscisic
acid response pathway?
a. cyclic ADP-ribose b. Ca2+ c. protein kinases d. cyclic ADP-ribose and protein kinases e. cyclic ADP-ribose, Ca2+ and protein kinases
In bacteria, transcription termination is partly controlled by?
a. the -10 and -35 sequences in the promoter b. hairpin loops in the RNA c. the polyA tail d. the translation start site
Darwin read Lyell's book, Principles of Geology, while serving as ship's naturalist on the HMS Beagle. Lyell's work influenced Darwin in which of the following ways?
a. Prior to publishing On the Origin of Species, Darwin published three books on geology. b. Darwin's ideas on the gradual changes associated with evolution are biological interpretations of Lyell's uniformitarian ideas. c. By explaining Earth's dramatic geological features through uniformitarianism, Lyell conceived the world as changing across enormous expanses of time. d. All of the above.