It is hypothesized that the high diversity of rock-dwelling species within the cichlids is due to:
a. allopolyploidy.
b. poor water quality.
c. polyploidy coloration.
d. disruptive sexual selection.
e. macroevolution
D
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The most direct ancestors of land plants were probably _____
A) kelp (brown alga) that formed large beds near the shorelines B) green algae C) photosynthesizing prokaryotes (cyanobacteria) D) liverworts and mosses
Which of the following are features of guard cells that enable them to function?
A. thick inner walls B. chloroplasts C. cellulose microfibrils D. their shape E. All of these are true
Fruit ripening is promoted by ____
a. ethylene b. jasmonates c. gibberellins d. brassinosteroids e. abscisic acid
B cells can generate antibodies with over 1010 different antigen-binding sites. How do so many different antibodies fit onto a single B cell?
A. B cells have wavy, invaginated plasma membranes to provide more surface area. B. B cells have long flagella-like extensions to provide more surface area. C. B cells are unusually large cells. D. They don't-each B cell makes only a single variety of antibody.