Fruit flies all look more or less alike. If you have a male and female fruit fly, how could you test the hypothesis that they're the same species?
A) Determine the sequence of several of their genes.
B) Examine them closely under a microscope, and compare what you see to a published description of fruit flies.
C) See if they'll mate when they're put together.
D) See if they mate and if their offspring can also mate.
D
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You wish to determine the cellular location of a protein but unfortunately it is not particularly antigenic (i.e., it can't develop a strong antibody response). How could you solve this problem?
A. Create a fusion protein with an epitope tag that can be visualized by incubation with fluorescently tagged antibody to the epitope. B. Create a fusion protein with an epitope tag that is fluorescent without the addition of antibodies. C. Create a fusion with green fluorescent protein (GFP). The fusion protein will fluoresce when streptavidin is added. D. Express the protein as a fusion with biotin. The addition of GFP will cause fluorescence. E. None of these methods will work.
The process by which soil bacteria convert NH3 or NH4 to nitrate (NO3-) is called
A. assimilation. B. denitrification. C. Decomposition. D. nitrification. E. ammonification.
Most epidermal cells are ___
a. melanocytes b. keratinocytes c. collagenocytes d. phagocytes e. erythrocytes
__________ is a gradual variation in phenotypes and genotypes over a geographic span
a. A cline b. An ecotone c. A realm d. A biosphere e. A community