Compared with plants growing in sunlight, plants growing in shade tend to have a greater
A) rate of photosynthesis.
B) specific leaf area.
C) light compensation point.
D) light saturation point.
B
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An individual who has two identical alleles for a trait is said to be ___________
A. Homozygous B. Heterozygous C. Isozygous D. A variant
The toxin of Vibrio cholerae causes severe diarrhea because it ____
a. modifies DAG and activates a cascade of protein kinases b. activates phospholipase to produce inositol triphosphate c. decreases the cytosolic concentration of Ca++ d. modifies a G protein involved in regulating salt and water secretion e. binds with adenylyl cyclase and triggers formation of cAMP
The major reason why there are fewer antiprotozoal drugs than antibacterial drugs is because ________.
A. antiprotozoal drugs cost much more than antibacterial drugs to develop B. antiprotozoal drugs are only effective when injected C. it is much more difficult to develop selectively toxic antiprotozoal drugs since protozoan cells are eukaryotic D. antiprotozoal drugs are not needed in the United States
In which model of evolution are many transitional forms predicted?
A. gradualistic B. punctuated equilibrium C. Neither punctuated equilibrium nor gradualistic. D. Both punctuated equilibrium and gradualistic.