Male mallard ducks have had emerald green head feathers and wings with metallic blue patches for hundreds of years,
whereas females have been drab, brown-feathered ducks. This phenotypic situation suggests that mallards may be an
example of ____.
a. directional selection
b. Polyploidy
c. allopatric speciation
d. disruptive selection
e. sexual selection
ANSWER: e
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A scientist discovers a new species near coral reefs in Australia. On basic microscopic examination and after conducting a few simple experiments, he finds that this single-celled species is photosynthetic (using sunlight for energy),
has a rigid cell wall structure with no peptidoglycan, uses a flagellum for motion, and contains a variety of internal structures that are bound by plasma membranes. Given this information, this new species is most likely a ______ cell in the _____ subcategory. A. bacterial; eubacterial B. eukaryotic; fungus C. archaebacterial; fungus D. eukaryotic; algae E. eukaryotic; protozoan
Which term refers to the microscope's ability to show two separate objects as discrete and distinct?
A. Resolution B. Contrast C. Refraction D. Magnification
Biogeography is the study of
a. the distribution of land masses. b. the patterns in the geographical distribution of species. c. the patterns of species dispersal. d. the pattern of population demographics. e. none of these
The organism responsible for the majority of neonatal meningitis is ________.
A. Neisseria meningitidis B. Escherichia coli K1 C. Listeria monocytogenes D. Haemophilus influenzae E. Streptococcus agalactiae