Ug99 is a type of ____________, and is a fungus (rust) that has decimated wheat crops
A. chytrid
B. ascomycete
C. basidiomycete
D. glomeromycete
E. zygomycete
C
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What is the effect of ionizing radiation on DNA?
a. faster replication b. the formation of nucleotide dimers c. kinks in the DNA molecule d. breaks in the DNA molecule e. base pair mismatching
Where in a plant cell is chlorophyll found?
a. on the outer chloroplast membrane b. in the cytoplasm of the cell c. in the stroma d. in the thylakoids e. none of these
Eutrophication of a lake most likely is the result of
A) an increase in oxygen content of the water. B) elevated nitrogen and oxygen gas levels in the water. C) an increase in atmospheric pressure associated with surface waters. D) competitive exclusion. E) excessive concentrations of organic and inorganic nutrients.
Which of the following statements concerning saliva is FALSE?
a. Saliva moistens food. b. Saliva is secreted by three pairs of salivary glands. c. Saliva dissolves food so it can be tasted. d. Saliva starts the enzymatic digestion of lipids. e. Saliva starts the enzymatic digestion of starch.