Blister rust is an invasive disease that most impacts the __________ population
a. American chestnut tree
b. bald eagle
c. grizzly bear
d. Siberian tiger
C
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Which of the following causes a foodborne intoxication?
A. Staphylococcus aureus B. E. coli O157:H7 C. Clostridium botulinum D. Mycobacterium tuberculosis E. Staphylococcus aureus, E. coli O157:H7, AND Clostridium botulinum
Under the Linnean system of classification which level is an immediate subcategory of Phylum?
a. Species b. Kingdom c. Family d. Order e. Class
In ____________________ membranes, layers secrete fluid that fills the space between the two surfaces. Fill in the blank(s) with the appropriate word(s)
Pax6 is a transcription factor noted for its unique role in specifying eye development across the animal kingdom. A homologous gene known as eyeless specifies eyes in Drosophila, and misexpression of mouse Pax6 can cause ectopic eyes in flies! This creates a quandary - how can we explain the universality of the master regulatory gene for eye development, with the striking variability of eye anatomy in different phyla?Misexpression of the Pax6 gene was shown to promote eye development in both vertebrates and invertebrates. The authors of this study suggested that this was evidence that eyes evolved only once. What other evidence contradicts this view?
A. Invertebrates normally have only simple eyespots. B. The anatomical structure of insect, mollusk, and vertebrate eyes are quite different. C. Many different transcription factors can initiate eye development when misexpressed. D. While the anatomy of all animal eyes is the same, lens proteins vary greatly.