African black-bellied seedcracker finches have beaks that are either large or small. Only large-beaked birds can crack open hard seeds, and small-beaked birds are more adept at handling small seeds. Both have an advantage over intermediate-sized beaks
This is an example of a response to:
A) disruptive selection. B) sexual selection.
C) directional selection. D) stabilizing selection.
Answer: A
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A localized collection of pus in a wound is termed a(n)
A. leukocyte. B. dead tissue. C. granulation mound. D. abscess.
Intestinal protozoan infections are typically spread by
A. the respiratory route. B. blood transfusion. C. body fluids. D. the fecal-oral route.
Scientists unearth a Wooly Mammoth from the Siberian Ice Sheath and discover that a eukaryotic "amoeba"-like cell is still alive. Which component of the cell membrane might contribute to maintaining the fluidity of plasma membranes under freezing conditions?
A. peripheral proteins B. high levels of long phospholipid tails within the lipid bilayer C. high levels of unsaturated phospholipid tails within the lipid bilayer D. absence of cholesterol E. high levels of saturated phospholipid tails within the lipid bilayer
Early one morning in a microbiology class, a student examining his cheek scraping slide with a light microscope, spots an unusual bunch of cells mixed in with the large nucleated cells from his cheek. His instructor takes a look and informs him that they are bacteria. Would those be prokaryotic or eukaryotic cells?
a. both b. neither c. prokaryotic d. eukaryotic