Birds, snakes, lizards, turtles, and crocodiles are all thought to share a common ancestor and several homologous traits. Assuming that this is true, these groups of animals and their common ancestor would represent
A. a polyphyletic group.
B. an outgroup.
C. a species cluster.
D. a monophyletic group.
E. homoplastic convergence.
Answer: D
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Which of the following best explains why bees aren't attracted to red flowers?
A. Bees perceive red as a warning signal. B. Bees can't see red. C. Red flowers usually are odorless. D. Red flowers do not produce nectar. E. Red flowers are imperfect and do not produce pollen.
Following infection, a typical first-line defense of the host's immune system is
A) reduction in white blood cell count. B) release of antibodies. C) forming cysts. D) inflammation.
Hox genes are a family of transcription factors that regulate development throughout the animal kingdom. Studies of Hox genes in mice and Drosophila showed that many Hox genes are conserved between both species, and several Hox genes duplicated into new genes with novel functions within mice. Some Hox genes have even lost all function. Hox genes provide an example of which of the following? Check all that apply.
A. pseudogenes B. heterologues C. orthologs D. paralogs
The layer of cells called the endoderm in the developing embryo eventually gives rise to
A. connective tissue and muscle. B. hair and nails. C. the lining of the gut and associated organs. D. the epidermis and nervous system.