An organ is defined as
a. one or more tissue types that perform
specific functions.
b. a tissue that is unique is its function.
c. various tissues that perform different
functions.
d. two or more tissues organized and capable
of carrying out a specific task.
e. none of these.
D
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The biosynthetic pathway for chlorophyll includes approximately how many steps?
A. 3 B. 6 C. 10 D. 17 E. 40
Through studies using the animal cap assay this morphogen was shown to be important for the determination of the different types of mesoderm tissue in the developing embryo.
A. activin B. noggin C. Spemann's organizer D. Hox gene E. cadherins
Fungi are ecologically important for all of the following reasons, except
A. They break down organic materials and return them to the ecosystem. B. All can exist in symbiotic relationships. C. Some can ferment and produce bread, beer, wine, cheese, and soy sauce. D. Some cause diseases in plants and animals. E. They can break down lignin.
Stratification refers to the extended exposure to ________ that is required for some seeds to germinate.
A. clay soil particles B. long wavelengths of light C. low temperatures D. short daylengths E. high relative humidity